CN109471152A - The collimator apparatus and its measuring system of gamma rays flux can be automatically adjusted - Google Patents
The collimator apparatus and its measuring system of gamma rays flux can be automatically adjusted Download PDFInfo
- Publication number
- CN109471152A CN109471152A CN201811068406.8A CN201811068406A CN109471152A CN 109471152 A CN109471152 A CN 109471152A CN 201811068406 A CN201811068406 A CN 201811068406A CN 109471152 A CN109471152 A CN 109471152A
- Authority
- CN
- China
- Prior art keywords
- collimator
- sliding block
- gamma rays
- detector
- shielding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Measurement Of Radiation (AREA)
Abstract
The present invention provides collimator apparatus and measuring system that one kind can automatically adjust gamma rays flux, collimator external shielding body leading portion is provided with collimation window, back segment is provided with through hole, and detector is connected across through hole, and gamma rays can enter in detector from collimation window.Servo motor and speed-changing gear box are connect by gear assembly connecting rod and gear assembly with lead screw；Two guide rails are sloped inwardly along collimation window and are symmetrically installed on two sides centered on detector；Lead screw is driven by control servo motor, and then sliding block is shielded by shielding slab slide link driving collimation mouth, the position of collimation mouth shielding sliding block is adjusted, changes the size of collimation window, realize the regulatory function of gamma rays flux.The device can automatically adjust the gamma rays flux for entering detector sensitive volume according to first measured value, and have similar regulatory function to low energy to high-energy ray, easy to operate, compact-sized, be suitable for nuclear power plant and Application of Nuclear Technology radioactive waste detection system.
Description
Technical field
The present invention relates to nuclear radiation detection technical fields, and in particular, to one kind can automatically adjust gamma rays flux
Collimator apparatus and its measuring system, the detection system collimator that can automatically adjust gamma rays flux more particularly, to one kind fill
It sets.
Background technique
It is segmented gamma scanning technique (Segmented Gamma Scanning, SGS) and tomographic gamma scanning technique
(Tomographic Gamma Scanning, TGS) as important non-destructive analysis (Non-Destructive Assay,
NDA) technology has been widely used for the detection of nuclear power plant's barreled waste.Its cardinal principle is to measure gal according to radiation detector
The counting of Ma ray and energy measure the power spectrum of gamma rays in conjunction with multi-channel analyzer, the type of nucleic are determined, further according to counting
Rate carries out the reconstruction of activity, determines the activity of nucleic.High purity germanium detector is now mostly used to carry out the measurement of gamma rays.
There are the dead times for the measurement of gamma rays.Since the electronics circuit of detector handles the photon needs of each entrance
It takes a certain time, when the transmitted intensity for entering detector is too big, complete and next penetrates there are previous ray is also untreated
The case where line comes into, the ray entered afterwards at this time may not be processed, this i.e. dead time effects.Dead time is that influence is high-purity
One key factor of germanium detector systematic survey accuracy, the dead time is larger to be will cause the counting that measurement obtains and loses,
The counting measured is less than normal compared with actual value.For SGS technology, when due to measurement target activity it is larger, in turn result in HpGe spy
When the examining system dead time is larger, the number of rays of detector sensitive volume can be entered by reducing, widens SGS measuring system
Detect the upper limit.Existing method include: before collimator plus set shielding slab, by adjust collimator overall structure change aperture it is big
It is small etc..In practical applications, enter detector sensitive volume number of rays by adding the method for setting shielding slab to may be implemented to reduce
Purpose, studies have found that, for this method to the attenuating of different-energy ray there are greatest differences, high-energy ray penetrates energy
Power is strong, and attenuation ratio is significantly less than low energy ray, therefore when high-energy ray being caused normally to measure, part low energy ray can not penetrate screen
It covers block to enter in detector sensitive volume, causes measurement error is big even can not effectively be measured.By adjusting collimator
The method that overall structure changes opening size, is able to solve the problem of low energy ray can not be detected, but due to design
Defect needs to occupy biggish space and carries out integrally-built adjusting, is unfavorable for promoting and applying in actual detection system.In addition,
Compared with SGS technology, need to be open TGS technology smaller collimator, but can automatically adjust openings of sizes currently without one kind
Take into account the collimator apparatus of SGS and TGS measuring system.
In view of defect existing for above-mentioned measuring system collimator apparatus, the present invention proposes that one kind can automatically adjust gamma rays
The collimator apparatus of flux, setting can change the shielding sliding block of collimation mouth size inside collimation mouth, realize to ray flux
It adjusts.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide the standards that one kind can automatically adjust gamma rays flux
Straight device device and its measuring system.
The one kind provided according to the present invention can automatically adjust the collimator apparatus of gamma rays flux, including collimator external screen
The cavity for covering body, being formed by collimator external shielding body inner space；The leading portion of collimator external shielding body is provided with collimation window, quasi-
The back segment of straight device external shielding body is provided with through hole, and the through hole connects detector, gamma rays can from collimation window into
Enter in detector；Setting collimation mouth shielding slide block assembly, shielding sliding block self-checking device, collimation mouth shield sliding block group in cavity
The movement of part can adjust the size of collimation window, the fortune of shielding sliding block self-checking device control collimation mouth shielding slide block assembly
It is dynamic.
Preferably, the shielding sliding block self-checking device include servo motor, speed-changing gear box, gear assembly connecting rod,
Guide assembly, lead screw, gear assembly；
Servo motor, speed-changing gear box are arranged on the outer surface of collimator external shielding body, gear assembly connecting rod, guide rail group
Part, lead screw, gear assembly setting are in the cavity；
Servo motor connection gear gearbox；
Speed-changing gear box is connected by gear assembly connecting rod, gear assembly and lead screw；
Lead screw connection collimation mouth shields slide block assembly；
Guide assembly is arranged along the axial direction of collimator external shielding body, and the axial direction is parallel with detector or close flat
Row, to increase adjustable range, guide assembly is another with the connection angle and guide assembly and collimator external shielding body that collimate window
The connection angle of one end is inconsistent, and effect is the spacing in two shielding sliding blocks of collimator window less than in collimator chamber
Spacing；
Servo motor is moved by driving lead screw, driving collimation mouth shielding slide block assembly along guide assembly.
It preferably, further include pedestal, lead screen block fixation kit, the collimator external shielding body is mainly by collimator
Lining, lead screen block composition；
Collimator liner is steel material, is the skeleton structure of collimator external shielding body, plays reinforced structure intensity, fixed lead
The effect of shielding slab.
Lining is arranged in collimator in the through hole, meets gamma rays incident direction, lead screen block is located in collimator
The two sides of lining, and the connection that cooperates, it acts as shieldings by the gamma ray of side incidence；
Lead screen block is fixedly mounted on pedestal by lead screen block fixation kit.
Preferably, the shielding sliding block self-checking device further includes limit switch, and limit switch can limit shielding and slide
Block assembly prevents and wall surface interference and collision along the motion range of lead screw.
Preferably, the limit switch at least there are two, two limit switches are separately positioned on the both ends of lead screw.
Preferably, the guide assembly is mainly made of the first guide rail, the second guide rail；The collimation mouth shields slide block assembly
Mainly by the first sliding block, the second sliding block the two shielding sliding blocks form；First sliding block can slide on the first guide rail, and second is sliding
Block can slide on the second guide rail；First sliding block, the second sliding block are connected by shielding slab slide link with lead screw, and first is sliding
The holding of the distance between the distance between block and detector and the second sliding block and detector is identical.
The one kind provided according to the present invention can automatically adjust the measuring system of gamma rays flux, including preceding claim
The collimator apparatus that gamma rays flux can be automatically adjusted further includes software controlled machine；Software controlled machine and servo motor,
Detector is connected.
Preferably, the software controlled machine includes detector data acquisition module, dead time comparison module, ray flux
Adjust determination module, driving adjustment module；The counting rate of detector data acquisition module acquisition detector；Dead time comparison module
Compare counting rate and dead time threshold value, obtains comparison result；Ray flux adjusts determination module and is determined according to the comparison result
Flux, the amplitude of accommodation whether are adjusted, obtains determining result；Adjustment module is driven to be sent according to the judgement result to servo motor
Driving signal.
Preferably, the calculation method of the counting rate are as follows:
In formulaN-th of energy gamma rays measuring of detector when being located at i-th of position for shielding sliding block after adjusting
Counting rate；αnN-th of energy gamma ray branching ratio is issued for radionuclide in waste；A is the activity of radionuclide, single
Position Bq；EnTo the detection efficient of n-th of energy gamma ray when being located at the position for shielding sliding block, i.e., original detection efficient,
Wherein, the position refers to the position for not having regulatory function；ξniFor when shielding sliding block and being located at i-th of position n-th
The damping ratios of energy gamma ray detection efficiency, i.e. adjustment factor；To ξniEstablish database, when use according to ray energy,
Slide position number, looks into value automatically, implements the amendment that activity is rebuild:
Ar=A'/ξni
Wherein A' is that detection system rebuilds the radioactive activity provided, is calculated and is obtained using original detection efficient, ArTo repair
Radioactive activity after just.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, the present invention is slided using shielding sliding block, collimation mouth opening size is adjusted, to adjust into collimator ray
Flux will not generate apparent difference to different-energy ray, and the detection that can take into account low energy ray and high-energy ray very well needs
It asks.
2, sliding block is arranged in collimation window interior in the present invention, adjusts collimation window size by sliding block movement, does not influence
The monnolithic case of collimator does not need to propose external detection system additional assembly demand, while internal sliding block volume mass phase
To small, implementation automation control can be facilitated.
3, the present invention adjusts ratio according to ray flux, and several slide positions are arranged, establish adjustment factor database, predicts
Regulation stall and slide position are determined after amount, provides servo motor instruction, automatically move shielding slab to setting position, after measurement again
Adjustment factor is automatically extracted, radioactive activity result is corrected.
4, mechanical structure and control logic of the present invention are simple, and operational reliability is high, convenient whole with the progress of existing detection system
It closes, the general measure process for modifying existing detection system and amendment efficiency calibration data is not needed, conducive to the popularization and application of device.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the outside side view of detector and collimator apparatus；
Fig. 2 is the appearance front view of detector and collimator apparatus；
Fig. 3 is the collimator external shielding body structural schematic diagram of collimator apparatus；
Fig. 4, Fig. 5 are collimator apparatus internal part structure chart；
Fig. 6, Fig. 7 are collimator apparatus internal regulation sliding block adjusting position schematic diagram；
Fig. 8 is collimator apparatus inside main dimensions schematic diagram；
Fig. 9 is adjusting slider different location Δ x and opening width Δ y relation curve；
Figure 10 is for adjusting slider in different location to the adjustment factor curve of different-energy ray.
It is shown in figure:
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
The invention discloses the collimator apparatus that one kind can automatically adjust gamma rays flux, the device is quasi- using collimator
The inner space Zhi Kou adjusts collimation window size, so that the gamma ray for adjusting entrance is logical by shielding the movement of slide position
Amount.The device can guarantee the accuracy of measurement of different radioactive level pails for used dressings, widen the detection upper limit of detection system, while simultaneous
Care for the size requirement of SGS and TGS technology collimation mouth.
As shown in Figure 1 and Figure 2, can automatically adjust gamma rays flux collimator apparatus include collimator external shielding body 2,
The cavity formed by 2 inner space of collimator external shielding body；The leading portion of collimator external shielding body 2 is provided with collimation window, preferably
Ground, the collimation window are rectangle setting, and the back segment of collimator external shielding body 2 is provided with through hole, and the through hole connection is visited
Device 1 is surveyed, gamma rays can enter in detector 1 from collimation window, and collimator liner is arranged in the back segment of collimator external shielding body 2
5, through hole is set on collimator liner 5, it is preferable that through hole is provided in round.
It is protruded into the cavity inside collimator external shielding body 2 as shown in figure 3, detector 1 passes through through hole, it being capable of shading ring
The ray of border background；When installation, the probe of detector 1 is attached combination across the round through hole of collimator liner 5, guarantees only
There is the ray of the collimation window by the front end rectangle of collimator apparatus just to can enter detector sensitive volume；Window is collimated in cavity
Mouth both ends setting collimation mouth shielding slide block assembly 12, shielding sliding block self-checking device, collimate the fortune of mouth shielding slide block assembly 12
Kinetic energy enough adjusts the size of collimation window, the movement of shielding sliding block self-checking device control collimation mouth shielding slide block assembly 12.
As shown in Figure 4, Figure 5, shielding sliding block self-checking device includes servo motor 3, speed-changing gear box 4, gear assembly
Connecting rod 11, guide assembly 13, lead screw 14, gear assembly 15；Servo motor 3, speed-changing gear box 4 are arranged in collimator external shielding body
On 2 outer surface, specifically, it is mounted on 5 outside of collimator liner, gear assembly connecting rod 11, guide assembly 13, lead screw 14, tooth
Wheel assembly 15 is arranged in the cavity；3 connection gear gearbox 4 of servo motor；Speed-changing gear box 4 passes through gear assembly connecting rod
11, gear assembly 15 is connect with lead screw 14；The connection collimation mouth of lead screw 14 shields slide block assembly 12；Guide assembly 13 is outside collimator
The axial setting of shield 2, and the axial direction and detector 1 are parallel or close to parallel, further increase adjustable range, guide rail
Component 13 and the connection angle and guide assembly 13 and the connection angle of the other end of collimator external shielding body 2 of collimation window are different
It causes, the spacing of the first sliding block 121 and the second sliding block 122 that collimator window is arranged in is less than in the indoor spacing of collimator chamber；
Servo motor 3 is moved by driving lead screw 14, driving collimation mouth shielding slide block assembly along guide assembly 13.Pass through control servo electricity
Machine 3 drives lead screw 14, and then by shielding slab slide link driving shielding sliding block, adjusts the position of shielding sliding block, change collimation
The size of window realizes the regulatory function of gamma rays flux.
Specifically, the collimator apparatus that can automatically adjust gamma rays flux further includes pedestal 10, the fixed group of lead screen block
Part 7, the collimator external shielding body 2 are mainly made of collimator liner 5, lead screen block 6；The material of collimator liner 5 is preferred
Using steel material, skeleton structure of the collimator liner 5 as collimator external shielding body 2 plays reinforced structure intensity, fixed lead shield
Cover the effect of block 6.The rear end of collimator external shielding body 2 is arranged in collimator liner 5, and lead screen block 6 is arranged in collimator external screen
The two sides of body 2 are covered, collimator liner 5 is connected with lead screen block 6；As shown in figure 3, lead screen block 6 is by the fixed group of lead screen block
Part 7 is fixedly mounted on pedestal 10.Bolt slot 9 is provided on pedestal 10, it is using bolt 8 that lead screen block fixation kit 7 is fixed
In bolt slot 9, whole fixation collimator apparatus guarantees that the position of the collimator apparatus in measurement is not moved；Installation
When, shielding slab fixation kit 7 is buckled on the lead screen block 6 of collimator external shielding body 2, is carried out at pedestal 10 by bolt 8
It is fixed.
The shielding sliding block self-checking device further includes limit switch 16, and limit switch 16 can limit shielding sliding block group
Part 12 prevents and wall surface interference and collision along the motion range of lead screw 14.The limit switch 16 at least there are two, limit switch 16
It is separately positioned on the both ends of lead screw 14.The scope of activities for collimating mouth shielding slide block assembly is limited in first position by limit switch 16
Between the second position, the adjustable range of collimation mouth shielding slide block assembly is limited, protective device is played the role of.Such as Fig. 6
Shown, the first sliding block 121, the second sliding block 122 are located at first position, and when in said first position, collimation window is adjusted to minimum
Opening size；As shown in fig. 7, the first sliding block 121, the second sliding block 122 are located at the second position, and when at the second position, collimation
Window is adjusted to maximum open size.
As shown in Figure 4, Figure 5, the guide assembly 13 is made of the first guide rail 131, the second guide rail 132；First guide rail
131, the second guide rail 132 is symmetrically installed on two sides along the inward slant of 2 front end of collimator external shielding body and centered on detector,
It is from outside to inside in the setting of splayed shape along collimation window.The collimation mouth shielding slide block assembly 12 is sliding by the first sliding block 121, second
Block 122 forms；First sliding block 121 can slide on the first guide rail 131, and the second sliding block 122 can be slided on the second guide rail 132
It is dynamic；First sliding block 121, the second sliding block 122 are connected by shielding slab slide link 17 with lead screw 14, the first sliding block 121 and spy
It is identical to survey the holding of the distance between the distance between device 1 and the second sliding block 122 and detector 1, guarantees that collimation mouth shields sliding block group
Part moves synchronously.The automatic adjustment of slide block assembly 12 is shielded by collimation mouth, thus it is possible to vary the first sliding block 121, the second sliding block
122 position, and then change the openings of sizes of collimation window, realize the automatic adjustment of gamma rays flux.The device being capable of root
Enter the gamma rays flux of detector sensitive volume according to the automatic adjustment of first measured value, and has to low energy to high-energy ray similar
Regulatory function, it is easy to operate, compact-sized, it is suitable for nuclear power plant and Application of Nuclear Technology radioactive waste detection system.
As shown in figure 8, having marked collimator apparatus inside main dimensions in figure, it can refer to illustrated dimensions in actual fabrication,
It can be changed according to a certain percentage.
The invention also discloses one kind can automatically adjust the measuring system of gamma rays flux, including above-mentioned automatically adjusts
The collimator apparatus of gamma rays flux further includes software controlled machine；Software controlled machine and servo motor 3,1 phase of detector
Connection.The software controlled machine includes detector data acquisition module, dead time comparison module, ray flux adjusting judgement mould
Block, driving adjustment module；Detector data acquisition module is used to acquire counting rate, the dead time parameter of detector 1；Dead time ratio
To module for comparing counting rate and dead time threshold value；Ray flux adjusts determination module according to the comparison of dead time comparison module
Whether result judgement adjusts flux, the amplitude of accommodation；Driving adjustment module adjusts the result of determination module to watching according to ray flux
It takes motor 3 and sends driving signal.I+1 different slide position is set in slider track direction, does not have adjusting function from innermost end
It can start as the 0th position, number consecutively: 0,1,2 ..., i ..., I, according to 0 position sensor preliminary measurement results and extremely
Time, it is determined whether the amplitude for needing to carry out adjusting and the adjusting of ray flux determines Position Number, rotates to servo motor
Stroke signal drives lead screw, and driving adjusts shielding sliding block and reaches corresponding position, thus change the openings of sizes of collimation window, it is real
The function that existing ray flux is adjusted.
When being measured to radioactive substance, radioactive substance is issued using high purity germanium detector 1 gamma rays into
Row detection, the data that detector 1 measures can obtain the radioactive nucleus prime information in radioactive substance by spectrum analysis, reconstructed
Calculate the activity that can obtain radionuclide.In order to eliminate influence of the environment to measurement itself, increase outside detector crystal
Lead screen and collimator apparatus.Detector 1 and collimator apparatus are fixed on detector platform, according to SGS technology and TGS technology
Measurement method carries out activity reconstruction to radioactive substance.If radioactive substance radioactive intensity is larger, it is easy to happen multiple gals
Ma ray enters detector crystal in a short period of time, and detector 1 is caused correctly can not to distinguish and export the meter of gamma ray
Number, i.e. generation dead time effects.
The measuring system disclosed by the invention for automatically adjusting gamma rays flux utilizes detector 1 in actual measurement
Preliminary survey is implemented to radioactive waste, the counting rate and dead time parameter provided according to detector, by the comparison setting of control software
Dead time threshold value, it is determined whether need to carry out the adjusting of ray flux, and determine the amplitude adjusted, determine that collimation mouth shields sliding block
The setting position of component 12 sends signal to servo motor 3, drives lead screw 14, slide into designated position along guide assembly 13, from
And change collimation mouth size, realize the function of adjusting and enter detector sensitive volume gamma flux.
At this point, the detector count rate obtained are as follows:In formulaIt is located at for shielding sliding block after adjusting
The counting rate for n-th of energy gamma rays that detector measures when i-th of position；αnN-th is issued for radionuclide in waste
A energy gamma ray branching ratio；A is the radioactive activity of radionuclide, unit Bq；EnIt is located at the position for shielding sliding block
To the detection efficient of n-th of energy gamma ray, i.e., original detection efficient when setting, wherein the position, which refers to not, to be had
The position of regulatory function；ξniFor the attenuation ratio of n-th of the energy gamma ray detection efficiency when shielding sliding block and being located at i-th of position
Value, i.e. adjustment factor；To ξniEstablish database, when use numbers according to ray energy, slide position, looks into value automatically, implements work
Spend the amendment rebuild:
Ar=A'/ξni
Wherein A' is that detection system rebuilds the radioactive activity provided, is calculated and is obtained using original detection efficient, ArTo repair
Radioactive activity after just.By above-mentioned adjusting, ensure that detection system to the detection accuracy of different radioactivity level pails for used dressings,
The detection upper limit for having widened measuring system, due to being to use to adjust ray flux, rather than shielding material directly absorbs ray, energy
Enough take into account the measurement request of low energy to high-energy ray.
By above-mentioned adjusting, it ensure that detection system to the detection accuracy of different radioactivity level pails for used dressings, has widened survey
The detection upper limit of amount system, can take into account the measurement request of low energy to high-energy ray.
Table 1 gives under typical nucleic, and collimation mouth shields sliding block in the adjustment factor ξ of different location, it can be found that this hair
Bright almost the same to the attenuating of low energy and high-energy ray, adjustable range is about 0.25 to 1, it may be possible to expand the detection upper limit
It is 4 times big.Meanwhile the adjusting method as used lead screen material absorbing gamma ray, different-energy gamma-ray decay effect is not
Unanimously.For example, when 2cm lead, when issuing 1.33MeV gamma-ray decay to 0.2871 to Co-60 nucleic, Ba-133 is issued
0.356MeV ray attenuation is to 0.002, and the two differs 100 times, and will cause Ba-133 nucleic can not effectively measure.
The adjustment factor that 1 present invention of table absorbs gamma ray method with shielding slab compares
In the description of the present application, it is to be understood that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description the application is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (9)
1. the collimator apparatus that one kind can automatically adjust gamma rays flux, which is characterized in that including collimator external shielding body
(2), the cavity formed by collimator external shielding body (2) inner space；
The leading portion of collimator external shielding body (2) is provided with collimation window, and the back segment of collimator external shielding body (2), which is provided with, to be run through
Hole, the through hole connect detector (1), and gamma rays can enter in detector (1) from collimation window；
Setting collimation mouth shielding slide block assembly (12), shielding sliding block self-checking device, collimation mouth shield slide block assembly in cavity
(12) movement can adjust the size of collimation window, and shielding sliding block self-checking device control collimation mouth shields slide block assembly
(12) movement.
2. the collimator apparatus according to claim 1 for automatically adjusting gamma rays flux, which is characterized in that the screen
Covering sliding block self-checking device includes servo motor (3), speed-changing gear box (4), gear assembly connecting rod (11), guide assembly
(13), lead screw (14), gear assembly (15)；
Servo motor (3), speed-changing gear box (4) are arranged on the outer surface of collimator external shielding body (2), gear assembly connecting rod
(11), guide assembly (13), lead screw (14), gear assembly (15) are arranged in the cavity；
Servo motor (3) connection gear gearbox (4)；
Speed-changing gear box (4) is connect by gear assembly connecting rod (11), gear assembly (15) with lead screw (14)；
Lead screw (14) connection collimation mouth shielding slide block assembly (12)；
Guide assembly (13) is arranged along the axial direction of collimator external shielding body (2), and the axial direction is parallel with detector (1) or connects
Close parallel, guide assembly (13) and the connection angle and guide assembly (13) that collimate window are another with collimator external shielding body (2)
The connection angle of one end is inconsistent；
Servo motor (3) is moved by driving lead screw (14), driving collimation mouth shielding slide block assembly (12) along guide assembly (13).
3. the collimator apparatus according to claim 2 for automatically adjusting gamma rays flux, which is characterized in that further include
Pedestal (10), lead screen block fixation kit (7), the collimator external shielding body (2) is mainly by collimator liner (5), lead screen
Block (6) composition；
The through hole is arranged on collimator liner (5), meets gamma rays incident direction, lead screen block (6) is located at collimator
The side of liner (5), collimator liner (5) are connected with lead screen block (6)；
Lead screen block (6) is fixedly mounted on pedestal (10) by lead screen block fixation kit (7).
4. the collimator apparatus according to claim 2 for automatically adjusting gamma rays flux, which is characterized in that the screen
Covering sliding block self-checking device further includes limit switch (16), and limit switch (16) can limit collimation mouth shielding slide block assembly
(12) along the motion range of lead screw (14).
5. the collimator apparatus according to claim 4 for automatically adjusting gamma rays flux, which is characterized in that the limit
Bit switch (16) at least there are two, two limit switches (16) are separately positioned on the both ends of lead screw (14).
6. the collimator apparatus according to claim 2 for automatically adjusting gamma rays flux, which is characterized in that described to lead
Rail assembly (13) is mainly made of the first guide rail (131), the second guide rail (132)；
Collimation mouth shielding slide block assembly is mainly by the first sliding block (121), the second sliding block (122) the two shielding sliding block groups
At；
First sliding block (121) can slide on the first guide rail (131), and the second sliding block (122) can be on the second guide rail (132)
Sliding；
First sliding block (121), the second sliding block (122) are connected by shielding slab slide link (17) with lead screw (14), and first is sliding
The holding of the distance between the distance between block (121) and detector (1) and the second sliding block (122) and detector (1) is identical.
7. the measuring system that one kind can automatically adjust gamma rays flux, which is characterized in that including any in claim 2 to 6
The collimator apparatus for automatically adjusting gamma rays flux described in kind, further includes software controlled machine；
Software controlled machine is connected with servo motor (3), detector (1).
8. the measuring system according to claim 7 for automatically adjusting gamma rays flux, which is characterized in that the software
Control device includes detector data acquisition module, dead time comparison module, ray flux adjusts determination module, driving adjusts mould
Block；
Detector data acquisition module acquires the counting rate of detector (1)；
Dead time comparison module compares counting rate and dead time threshold value, obtains comparison result；
Ray flux adjusts determination module and determines whether to adjust flux, the amplitude of accommodation according to the comparison result, obtains determining knot
Fruit；
Adjustment module is driven to send driving signal to servo motor (3) according to the judgement result.
9. the measuring system according to claim 8 for automatically adjusting gamma rays flux, which is characterized in that the counting
The calculation method of rate are as follows:
In formulaFor the counting for n-th of energy gamma rays that detector when shielding sliding block is located at i-th of position after adjusting measures
Rate；αnN-th of energy gamma ray branching ratio is issued for radionuclide in waste；A is the radioactive activity of radionuclide,
Unit Bq；EnTo the detection efficient of n-th of energy gamma ray when being located at the 0th position for shielding sliding block, i.e., original detection is imitated
Rate, wherein the 0th position refers to the position for not having regulatory function；ξniFor when shielding sliding block and being located at i-th of position the
The damping ratios of n energy gamma ray detection efficiency, i.e. adjustment factor；To ξniDatabase is established, according to radial energy when use
Amount, slide position number, look into value automatically, implement the amendment that activity is rebuild:
Ar=A'/ξni
Wherein A' is that detection system rebuilds the radioactive activity provided, is calculated and is obtained using original detection efficient, ArIt is revised
Radioactive activity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811068406.8A CN109471152B (en) | 2018-09-13 | 2018-09-13 | Collimator device capable of automatically adjusting gamma ray flux and measuring system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811068406.8A CN109471152B (en) | 2018-09-13 | 2018-09-13 | Collimator device capable of automatically adjusting gamma ray flux and measuring system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109471152A true CN109471152A (en) | 2019-03-15 |
| CN109471152B CN109471152B (en) | 2020-09-15 |
Family
ID=65664482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811068406.8A Active CN109471152B (en) | 2018-09-13 | 2018-09-13 | Collimator device capable of automatically adjusting gamma ray flux and measuring system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109471152B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650398A (en) * | 2020-05-29 | 2020-09-11 | 上海交通大学 | Device for measuring two-dimensional flow field inside circular tube by LDV (laser direct-current voltage) |
| CN112034504A (en) * | 2020-07-30 | 2020-12-04 | 武汉雅洛诗商贸有限公司 | Atmospheric radioactive scene radiation level detection station |
| CN112295113A (en) * | 2019-08-02 | 2021-02-02 | 上海西门子医疗器械有限公司 | Collimator shell, collimator and radiation imaging equipment |
| CN114188049A (en) * | 2021-12-02 | 2022-03-15 | 中国核动力研究设计院 | Ray monitoring device, monitoring method, monitoring system and storage medium |
| CN115429303A (en) * | 2022-08-24 | 2022-12-06 | 瑞石心禾(河北)医疗科技有限公司 | Cylindrical multi-pinhole collimator and imaging device thereof |
| WO2023035789A1 (en) * | 2021-09-09 | 2023-03-16 | 同方威视技术股份有限公司 | Ray collimation device and radiation inspection device |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3487218A (en) * | 1965-03-25 | 1969-12-30 | Euratom | Neutron collimator with a variable passage cross section |
| US3805081A (en) * | 1971-04-16 | 1974-04-16 | Licentia Gmbh | Collimator for high energy radiation |
| FR2331867A1 (en) * | 1975-11-14 | 1977-06-10 | Commissariat Energie Atomique | Collimator for neutron beam from a nuclear reactor - esp. water moderated, ensuring easier handling and minimum irradiation |
| JP2002214353A (en) * | 2001-01-18 | 2002-07-31 | Aloka Co Ltd | Radiation detector |
| CN1634617A (en) * | 2003-12-31 | 2005-07-06 | 深圳市尊瑞科技有限公司 | Collimation aperture variable collimation device and varying method thereof |
| CN101339819A (en) * | 2007-07-05 | 2009-01-07 | 同方威视技术股份有限公司 | Remote controllable collimator with four parts independently moving |
| CN203673839U (en) * | 2012-12-08 | 2014-06-25 | 成都威铭科技有限公司 | Variable field collimator |
| CN104793235A (en) * | 2015-03-25 | 2015-07-22 | 上海交通大学 | Detector dead time automatic regulating device for radioactive waste detection system |
| CN105242298A (en) * | 2015-09-07 | 2016-01-13 | 上海交通大学 | Transmission source storage and automatic adjusting device and radioactive waste detection system |
| CN106030264A (en) * | 2013-12-11 | 2016-10-12 | 控制辐射***有限公司 | X-ray reduction system |
| US20170040077A1 (en) * | 2015-08-05 | 2017-02-09 | Jefferson Science Associates, Llc | Apparatus and method for variable angle slant hole collimator |
| US9697980B2 (en) * | 2012-08-28 | 2017-07-04 | Canon Kabushiki Kaisha | Radiation generating tube and radiation generating apparatus including radiation generation tube |
-
2018
- 2018-09-13 CN CN201811068406.8A patent/CN109471152B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3487218A (en) * | 1965-03-25 | 1969-12-30 | Euratom | Neutron collimator with a variable passage cross section |
| US3805081A (en) * | 1971-04-16 | 1974-04-16 | Licentia Gmbh | Collimator for high energy radiation |
| FR2331867A1 (en) * | 1975-11-14 | 1977-06-10 | Commissariat Energie Atomique | Collimator for neutron beam from a nuclear reactor - esp. water moderated, ensuring easier handling and minimum irradiation |
| JP2002214353A (en) * | 2001-01-18 | 2002-07-31 | Aloka Co Ltd | Radiation detector |
| CN1634617A (en) * | 2003-12-31 | 2005-07-06 | 深圳市尊瑞科技有限公司 | Collimation aperture variable collimation device and varying method thereof |
| CN101339819A (en) * | 2007-07-05 | 2009-01-07 | 同方威视技术股份有限公司 | Remote controllable collimator with four parts independently moving |
| US9697980B2 (en) * | 2012-08-28 | 2017-07-04 | Canon Kabushiki Kaisha | Radiation generating tube and radiation generating apparatus including radiation generation tube |
| CN203673839U (en) * | 2012-12-08 | 2014-06-25 | 成都威铭科技有限公司 | Variable field collimator |
| CN106030264A (en) * | 2013-12-11 | 2016-10-12 | 控制辐射***有限公司 | X-ray reduction system |
| CN104793235A (en) * | 2015-03-25 | 2015-07-22 | 上海交通大学 | Detector dead time automatic regulating device for radioactive waste detection system |
| US20170040077A1 (en) * | 2015-08-05 | 2017-02-09 | Jefferson Science Associates, Llc | Apparatus and method for variable angle slant hole collimator |
| CN105242298A (en) * | 2015-09-07 | 2016-01-13 | 上海交通大学 | Transmission source storage and automatic adjusting device and radioactive waste detection system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112295113A (en) * | 2019-08-02 | 2021-02-02 | 上海西门子医疗器械有限公司 | Collimator shell, collimator and radiation imaging equipment |
| CN111650398A (en) * | 2020-05-29 | 2020-09-11 | 上海交通大学 | Device for measuring two-dimensional flow field inside circular tube by LDV (laser direct-current voltage) |
| CN111650398B (en) * | 2020-05-29 | 2021-08-06 | 上海交通大学 | Device for measuring two-dimensional flow field inside circular tube by LDV (laser direct-current voltage) |
| CN112034504A (en) * | 2020-07-30 | 2020-12-04 | 武汉雅洛诗商贸有限公司 | Atmospheric radioactive scene radiation level detection station |
| WO2023035789A1 (en) * | 2021-09-09 | 2023-03-16 | 同方威视技术股份有限公司 | Ray collimation device and radiation inspection device |
| CN114188049A (en) * | 2021-12-02 | 2022-03-15 | 中国核动力研究设计院 | Ray monitoring device, monitoring method, monitoring system and storage medium |
| CN115429303A (en) * | 2022-08-24 | 2022-12-06 | 瑞石心禾(河北)医疗科技有限公司 | Cylindrical multi-pinhole collimator and imaging device thereof |
| CN115429303B (en) * | 2022-08-24 | 2023-07-25 | 瑞石心禾(河北)医疗科技有限公司 | Cylindrical multi-pinhole collimator and imaging device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109471152B (en) | 2020-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109471152A (en) | The collimator apparatus and its measuring system of gamma rays flux can be automatically adjusted | |
| CN104714245B (en) | The half tomographic gamma scan method that middle cool waste bucket measures | |
| CN103308534B (en) | Chromatographic gamma scanning measurement method | |
| CA1115427A (en) | Method and apparatus for measuring underground fluid flow characteristics | |
| CN104793235B (en) | Radwaste detection system detector dead time self-checking device | |
| JPS61204582A (en) | Radioactivity distributing measuring method and instrument | |
| CN103901052B (en) | A kind of SGS and TGS combined measurement device and collimating apparatus optimization method | |
| Smith et al. | Signatures and Methods for the Automated Nondestructive Assay of ${\rm UF} _ {6} $ Cylinders at Uranium Enrichment Plants | |
| Biard | Quantitative analysis of the fission product distribution in a damaged fuel assembly using gamma-spectrometry and computed tomography for the Phébus FPT3 test | |
| CN203965630U (en) | A kind of emanometer | |
| US8842797B2 (en) | Gamma scanning apparatus | |
| RU137122U1 (en) | DEVICE FOR ANALYSIS OF MATERIALS BY MEANS OF LABELED NEUTRONS | |
| Lévai et al. | Feasibility of gamma emission tomography for partial defect verification of spent LWR fuel assemblies: Summary report on simulation and experimental studies including design options and cost-benefit analysis: Task JNT A1201 of the Support Programmes of Finland (FINSP), Hungary (HUNSP) and Sweden (SWESP) to the IAEA Safeguards | |
| Jacobsson et al. | A tomographic method for verification of the integrity of spent nuclear fuel assemblies—II: experimental investigation | |
| US3431413A (en) | Rotational technique for assessing quantity and distribution of body radioactivity | |
| Wilson et al. | The Hyper-Kamiokande Experiment | |
| JP2526392B2 (en) | Nondestructive inspection system for fuel rods for nuclear reactors | |
| CN105242298B (en) | Transmission source stores self-checking device and radwaste detection system | |
| Lévai et al. | Use of high energy gamma emission tomography for partial defect verification of spent fuel assemblies | |
| Chen et al. | Research of γ-ray 3D scanning detection and analysis system | |
| Allen et al. | Search for point sources of ultrahigh energy γ rays in the southern sky | |
| Anderl et al. | Compton scattered neutron capture gamma rays for photofission studies | |
| Durisch et al. | Determination of the Nuclear Symmetry Energy at 9.8 MeV. I. Experiment and Results | |
| Thorngate et al. | Energy and Angular Distribution of Neutrons and Gamma Rays: Operation BREN | |
| Avignone III et al. | Indirect interference of cosmic-muons with low background coincidence experiments |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |