CN106483549B - Detection method based on ionization chamber system - Google Patents
Detection method based on ionization chamber system Download PDFInfo
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- CN106483549B CN106483549B CN201610967027.7A CN201610967027A CN106483549B CN 106483549 B CN106483549 B CN 106483549B CN 201610967027 A CN201610967027 A CN 201610967027A CN 106483549 B CN106483549 B CN 106483549B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/185—Measuring radiation intensity with ionisation chamber arrangements
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Abstract
The present embodiments relate to a kind of detection methods based on ionization chamber system, include: that X-ray machine is set on X-ray machine platform；Added filtration piece is plugged on filtering device；Filtering device is adjusted, makes the X-ray Exit positions of added filtration piece center and X-ray machine in the same horizontal position；Driving first base moves to operating position on the first guide rail；And second base is driven to move to operating position on the second guide rail；Adjust the turntable on lifting device and lifting device, make the ionisation-chamber arrangements being set on turntable receive ray position and added filtration piece center, X-ray machine X-ray Exit positions on same straight line；X-ray machine generates primary x-ray beam；Primary x-ray beam filters out the ray lower than first threshold energy after added filtration piece；Filtered X-ray beam ionizes the air in ionisation-chamber arrangements, generates ionization current；Electrometer detects ionization current, obtains ionization current values.
Description
Technical field
The present invention relates to a kind of Radiation monitoring technical field more particularly to a kind of detection methods based on ionization chamber system.
Background technique
Leading benchmark ionisation chamber to be applied both at home and abroad at present includes free-air ionization chamber and graphite cavity ionization chamber.?
During 250kV~600kV X-ray air kerma benchmark is established, when x-ray tube voltage is more than 400kV, between secondary electron
Away from increase so that the electrode spacing of required free-air ionization chamber is very big, since free-air ionization chamber is in measurement higher-energy
Limitation in terms of section ray, is now intended to use graphite cavity ionization chamber as benchmark ionisation chamber.
Ionisation chamber detection system is the detector using the ionisation effect measurement ionising radiation of ionising radiation.It is ionized in application
During the detection system of room, the effect of added filtration piece is filtered to incident X-ray, and filtered X-ray is injected
Graphite ionization chamber makes air ionization in ionisation chamber generate ionization current.The position of graphite ionization chamber not can be carried out accurate adjusting, from
And lead to the low measurement accuracy of existing ionisation chamber detection system.
Summary of the invention
The purpose of the present invention is in view of the drawbacks of the prior art, providing a kind of detection method based on ionization chamber system, lead to
Cross multidimensional adjust stage apparatus can the position to ionisation-chamber arrangements accurately adjusted, to improve ionisation chamber detection system
Measurement accuracy, controllability is high.
To achieve the above object, the present invention provides a kind of detection methods based on ionization chamber system, described based on ionization
The detection method of chamber system includes:
X-ray machine is set on X-ray machine platform；
Added filtration piece is plugged on filtering device；
The filtering device is adjusted, makes the X-ray Exit positions of added filtration piece center and X-ray machine in same level position
It sets；
Control first motor driving first base moves to operating position on the first guide rail；And it controls the second motor to drive
Dynamic second base moves to operating position on the second guide rail；
The turntable on lifting device and the lifting device is adjusted, the ionisation-chamber arrangements being set on the turntable is made
Receive ray position and added filtration piece center, X-ray machine X-ray Exit positions on same straight line；
The X-ray machine generates primary x-ray beam；
The primary x-ray beam filters out the ray lower than first threshold energy after added filtration piece；
The ionisation-chamber arrangements receives filtered X-ray beam, and the filtered X-ray beam makes the ionisation-chamber arrangements
Interior air ionizes, and generates ionization current；
Electrometer detects ionization current, obtains ionization current values.
Preferably, the filtering device has filtration turntable, and it includes N number of optical filtering hole that the filtration turntable, which is equipped with, and the N is
Positive integer greater than 1, the added filtration piece are plugged in the optical filtering hole；The filtration turntable is driven by filtration rotating electric machine
It is dynamic；
It is described to adjust the filtering device specifically: the filtration rotating electric machine, which receives, filters rotating signal, described in driving
Turntable rotation is filtered, the added filtration piece of the filtration turntable is driven to rotate to working position.
Preferably, the turntable includes rotary drive motor, fixed part and rotating disk；The rotating disk is set to described
On fixed part；
The adjusting turntable specifically: the rotary drive motor receives rotating signal, drives the rotating disk in institute
It states and is rotated on fixed part.
Preferably, first guide rail includes: fixed platform, two sliding rails, the first sliding block and lead screw；
Two sliding rails are arranged in parallel in the fixed platform；The lead screw is set among two sliding rails,
And it is parallel to two sliding rails；First sliding block is set on the lead screw and is connected with the bottom of first base；
The control first motor drives the first base to move to operating position on the first guide rail specifically: described
First motor receives the first displacement signal, and the lead screw is driven to rotate, and drives first sliding block along the guide screw movement to work
Make position.
Preferably, after the electrometer detects ionization current, the detection method further include: described in change
The intensity and average energy of primary x-ray beam, are detected again.
It is further preferred that after the electrometer detects ionization current, the detection method further include: rotation
Turn the filtration turntable, replacement is in the added filtration piece of working position, is detected again.
Detection method provided in an embodiment of the present invention based on ionization chamber system, adjusting stage apparatus by multidimensional can be right
The position of ionisation-chamber arrangements is accurately adjusted, to improve the measurement accuracy of ionisation chamber detection system, controllability is high.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of ionization chamber system provided in an embodiment of the present invention；
Fig. 2 is the flow chart of the detection method provided in an embodiment of the present invention based on ionization chamber system.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detection method provided in an embodiment of the present invention based on ionization chamber system is implemented in ionization chamber system, the electricity
It include that multidimensional adjusts stage apparatus and filtering device from chamber system, the detection side that embodiment provides to facilitate the understanding of the present invention
Method combines Fig. 1 first, the ionization chamber system that invention detection method is based on is introduced.
Fig. 1 is the structural schematic diagram of ionization chamber system provided in an embodiment of the present invention.As shown, the embodiment of the present invention
Ionization chamber system includes: that multidimensional adjusts stage apparatus, filtering device (not shown), X-ray machine platform (not shown), electricity
From chamber device (not shown), added filtration piece (not shown) and X-ray machine (not shown).
Stage apparatus is adjusted to multidimensional first below to be described in detail:
Multidimensional adjusts stage apparatus for placing ionisation-chamber arrangements (not shown), adjusts platform dress by adjusting multidimensional
Set can the position to ionisation-chamber arrangements accurately adjusted.
It includes: mobile foundation 1, lifting device 2, the first guide rail 3, first base 4, the second guide rail that multidimensional, which adjusts stage apparatus,
5, second base 6 and turntable 7.
Mobile foundation 1 includes base platform 11 and multiple support columns 12；Wherein, the multiple for more than or equal to four；Base
Seat platform 11 is erected on multiple support columns 12, specifically, the bottom surface of base platform 11 and one end of multiple support columns 12 are fixed
Connection, multiple support columns 12 are arranged in parallel, and vertical with base platform 11；In order to guarantee the stability of mobile foundation 1, adjacent
It is additionally provided with connecting plate 13 between two support columns 12, pulley 15 is also mounted in the lower section of connecting plate 13, mobile base may be implemented
The rotation at any angle and movement of seat 1.In addition, the bottom of each support column 12 is designed with fixed part 14, fixed part 14 and branch
Connected between dagger 12 by extensible member (not shown), extensible member can to fixed part 14 and 12 bottom of support column it
Between distance be adjusted, to adjust the height of mobile foundation 1.It, can be with when mobile foundation 1 moves to suitable position
The height that mobile foundation 1 is adjusted by extensible member makes the bottom surface of fixed part 14 be lower than the ground of pulley 15, and such pulley 15 is not
With ground face contact, not can be carried out sliding, so that the position of mobile foundation 1 be fixed；When needing the position to mobile foundation 1
It sets when being adjusted, the height of mobile foundation 1 is adjusted by extensible member, the bottom surface of fixed part 14 is made to be higher than the ground of pulley 15
Face, such pulley 15 and ground face contact, can realize rotation and the position on 1 any direction of mobile foundation by the rotation of pulley 15
It moves.
Lifting device 2 be arranged on mobile foundation 1, including the first fixing seat 21, hoistable platform 22, the second fixing seat 23,
Motion platform 24, lifting driving motor 25 and lifting drive rod 26；Wherein, the first fixing seat 21 connects with base platform 11, the
One fixing seat 21 is equipped with multiple first fixed columns 211, and the second fixing seat 23 is erected in multiple first fixed columns 211, and first
The distance between fixing seat 21 and the second fixing seat 23 are fixed, the as length of the first fixed column 211, therefore the first fixation
Seat 21 is relatively stationary with the second fixing seat 23.
Hoistable platform 22 is arranged between the first fixing seat 21 and the second fixing seat 23, and hoistable platform 22 has the first screw thread
Hole and multiple second through-holes；Wherein, the quantity of the second through-hole is identical as the first fixed column 211, and the position of the second through-hole and the
The position of one fixed column 211 is corresponding, and hoistable platform 22 is socketed in the first fixed column 211 by the second through-hole；Lifting driving
Bar 26 is arranged in hoistable platform 22 by the first threaded hole；It goes up and down the driving lifting drive rod 26 of driving motor 25 to rotate, drives and rise
Platform 22 is dropped in the direction movement perpendicular to 21 place plane of the first fixing seat.
Motion platform 24 is moved synchronously with hoistable platform 22, specifically, it is fixed to be equipped with multiple second on hoistable platform 22
Column 221, has multiple third through-holes in the second fixing seat 23, and the quantity of third through-hole, position are opposite with the second fixed column 221
It answers, multiple second fixed columns 221 are arranged in the second fixing seat 23 via multiple third through-holes, and it is solid that motion platform 24 is erected at second
On fixed column 221, one end of the second fixed column 221 is connected with the top surface of hoistable platform 22, the bottom surface of the other end and motion platform 24
It is connected, therefore the distance between motion platform 24 and hoistable platform 22 are fixed, the as length of the second fixed column 221, are transported
Moving platform 24 and hoistable platform 22 move synchronously.When the lifting driving lifting drive rod 26 of driving motor 25 rotates, drive is risen
Second fixed column 221 of the platform 22 in the direction movement perpendicular to 21 place plane of the first fixing seat, on hoistable platform 22 drops
It is moved with hoistable platform 22, so that motion platform 24 be driven to put down with hoistable platform 22 is synchronous perpendicular to where the first fixing seat 21
The direction in face moves, and the first fixing seat 21 and the second fixing seat 23 are still stationary state at this time.
First guide rail 3 is mounted on motion platform 24, including fixed platform, two sliding rails, the first sliding block and lead screw；Two
Sliding rail is arranged in parallel in fixed platform；Lead screw is equipped among two sliding rails, lead screw is parallel to two sliding rails, is driven by first motor
Turn is dynamic；Lead screw is equipped with the first sliding block, with the rotation of lead screw along guide screw movement.
Parallel first guide rail, the 3 place plane of first base 4 is simultaneously slidably installed on the first guide rail 3, is transported along 3 direction of the first guide rail
It is dynamic；Specifically, the bottom surface both side of first base 4, which is equipped with two, ranked second sliding block, every row can set that there are two the second sliding blocks, wherein
The quantity of second sliding block is set according to the size of first base 4；Second sliding block cunning is slidably installed in the first guide rail 3 respectively
On two sliding rails, and two to ranked second the distance between the distance between sliding block and two sliding rails equal；The bottom surface of first base 4
It is fixedly connected with the first sliding block, first motor drives guide screw movement, drives the first sliding block along guide screw movement, to realize the first bottom
Seat 4 is moved along the first guide rail 3.
Second guide rail 5, is mounted in first base 4, vertical with 3 direction of the first guide rail.The structure of second guide rail 5, work
Principle is identical as the first guide rail 3, and details are not described herein again.
Second base 6, parallel first base 4 are slidably installed on the second guide rail 5, by the second motor driven, along 5 side of the second guide rail
To movement.The structure of second base 6 is identical as first base 4, and details are not described herein again.
In order to further realize the accurate adjusting that the multidimensional adjusts stage apparatus, the multidimensional adjusts stage apparatus
Further include turntable 7, turntable 7 is fixed in second base 6, the specific implementation of turntable 7 may include rotary drive motor,
Rotating base and rotating disk (not shown)；Rotating disk is arranged on rotating base；Rotary drive motor driving rotating disk exists
It is rotated on rotating base.
Below based on above-mentioned ionization chamber system, the calibration method of the ionization chamber system of the embodiment of the present invention is introduced, such as Fig. 2 institute
Show, the calibration method of the ionization chamber system of the embodiment of the present invention includes the following steps:
Step 110, X-ray machine is set on X-ray machine platform.
Specifically, X-ray machine is fixed on X-ray machine platform by the X-ray machine fixture on X-ray machine platform.
Step 120, added filtration piece is plugged on filtering device.
Specifically, filtering device has filtration turntable, it includes N number of optical filtering hole that filtration turntable, which is equipped with, and wherein N is greater than 1
Positive integer；By the added filtration piece of grafting different-thickness in different optical filtering holes.
Step 130, filtering device is adjusted, makes the X-ray Exit positions of added filtration piece center and X-ray machine in same level position
It sets.
First laser transmitter is equipped on X-ray machine platform, filtration turntable is equipped with the first mark position, the first marker bit
It installs among two neighboring optical filtering hole, first mark position is position according to first laser transmitter, X-ray machine
What the position and added filtration piece position of X-ray Exit positions were designed, it penetrates and is filtering when the laser of first laser transmitter transmitting
When crossing the first mark position of turntable, added filtration piece is in working position, at this time added filtration piece center and X-ray Exit positions
In the same horizontal position.
Specifically, filtration rotating electric machine receives filtration rotating signal, driving filtration turntable rotation drives the attached of filtration turntable
Filtration piece is added to rotate to working position, the laser of first laser transmitter transmitting at this time penetrates the first mark position in filtration turntable,
Added filtration piece center and X-ray Exit positions in the same horizontal position.Wherein, wherein filtration rotating signal can be by grasping
Make what personnel were issued by computer control system.
Step 140, control first motor driving first base moves to operating position on the first guide rail；Also, it controls
Second motor driven second base moves to operating position on the second guide rail.
After the position of X-ray machine platform and filtering device determines, need that the position of ionisation-chamber arrangements is adjusted.This
When, first motor receives the first displacement signal, and driving lead screw rotates, and the first sliding block is along guide screw movement to working position on drive lead screw
It sets, so that ionisation-chamber arrangements be driven to move to operating position on the first guide rail, realizes that ionisation-chamber arrangements is (parallel in X-direction
First guide rail direction) on position adjust；Then, the second motor receives second displacement signal, and driving lead screw rotation drives lead screw
Upper first sliding block is along guide screw movement to operating position, so that ionisation-chamber arrangements is driven to move to operating position on the second guide rail,
Realize that position of the ionisation-chamber arrangements in Y direction (parallel second guide rail direction) is adjusted.Wherein, the first displacement signal and second
Displacement signal, which can be, to be issued by computer control system by operator.
Step 150, the turntable on lifting device and lifting device is adjusted, the ionisation-chamber arrangements being set on turntable is made
Receive ray position and added filtration piece center, X-ray machine X-ray Exit positions on same straight line.
Specifically, lifting driving motor receives lifting driving signal, driving lifting drive rod rotation drives lifting drive rod
Upper hoistable platform is in plane motion where vertical first guide rail and the second guide rail, to realize ionisation-chamber arrangements in Z axis side
Position on (in-plane where vertical first guide rail and the second guide rail) is adjusted.Wherein, lifting driving signal can be by
Operator is issued by computer control system.
Secondly, rotary drive motor receives rotating signal, control rotating disk rotates on fixed part, from drive turntable
Ionisation-chamber arrangements rotation, make ionisation-chamber arrangements reception ray position and added filtration piece center on same straight line.
Wherein, rotating signal, which can be, is issued by computer control system by operator.
Specifically, turntable be equipped with second laser transmitter, filtration turntable be equipped with the second mark position, described second
Mark position is designed according to the position of the position of second laser transmitter, the position of ionisation-chamber arrangements and added filtration piece
, when second laser transmitter transmitting laser penetrate filter turntable the second mark position when, added filtration piece center and electricity
Reception ray position from chamber device is in the same horizontal position, to realize the reception ray position of ionisation-chamber arrangements and add filter
Cross piece center, X-ray machine X-ray Exit positions on same straight line.
Step 160, X-ray machine generates primary x-ray beam.
Specifically, opening the X-ray machine on X-ray machine platform, emit primary x-ray beam, the additional filter on directive filtering device
Cross piece.
Step 170, primary x-ray beam filters out the ray lower than first threshold energy after added filtration piece.
Wherein, first threshold is determined by selected added filtration piece, first threshold corresponding to different added filtration pieces
It is different.
Specifically, added filtration piece filters out the ray lower than first threshold energy of primary x-ray beam, filter just
The low energy part of beginning ray, and it is unobvious on the influence of the distribution of photons of energetic portions, and power spectrum is hardened, and is improved X-ray and is penetrated
Ability, but it is reduction of photon intensity.
Step 180, ionisation-chamber arrangements receives filtered X-ray beam, and filtered X-ray beam makes in ionisation-chamber arrangements
Air ionizes, and generates ionization current.
Ionisation-chamber arrangements can be graphite ionization chamber, including graphite chamber and collector, and filtered X-ray beam injects stone
In ink chamber, the indoor air ionization of graphite chamber is set to generate electronics, the indoor collection bar of graphite chamber is collected electronics, then leads to
Cross the transmission of collection bar.
Step 190, electrometer detects ionization current, obtains ionization current values.
The collection bar of electrometer and ionisation-chamber arrangements is attached, and detects to obtain ionization current values through electrometer.
Rotary filtering disk, replacement is in the added filtration piece of working position, using the filtration piece of different-thickness to initial X-ray
Beam is filtered, and the thickness of added filtration piece can change the degree of filtration to X-ray low energy part, the thickness of added filtration piece
The thicker low energy part filtered out relative to X-ray energetic portions is more, repeats above-mentioned steps 130 to step 190.Until complete
At the measurement of all required added filtration pieces.
Change load in the voltage of X-ray light pipe, so that the intensity of primary x-ray beam and average energy is changed, then weigh
Multiple above-mentioned steps 130 are to step 190, until completing the measurement of all required parameters.
Detection method provided in an embodiment of the present invention based on ionization chamber system, adjusting stage apparatus by multidimensional can be right
The position of ionisation-chamber arrangements is accurately adjusted, to improve the measurement accuracy of ionisation chamber detection system, controllability is high.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Unit and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It should not be considered as beyond the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (5)
1. a kind of detection method based on ionization chamber system, which is characterized in that the detection method includes:
X-ray machine is set on X-ray machine platform；
Added filtration piece is plugged on filtering device；
The filtering device is adjusted, makes the X-ray Exit positions of added filtration piece center and X-ray machine in the same horizontal position；
Control first motor driving first base moves to operating position on the first guide rail；And control the second motor driven the
Two pedestals move to operating position on the second guide rail；
The turntable on lifting device and the lifting device is adjusted, connecing for the ionisation-chamber arrangements being set on the turntable is made
Receive ray position and added filtration piece center, X-ray machine X-ray Exit positions on same straight line；Wherein, the rotation
Platform includes rotary drive motor, fixed part and rotating disk；The rotating disk is set on the fixed part；The adjusting turntable
Specifically: the rotary drive motor receives rotating signal, and the rotating disk is driven to rotate on the fixed part；Specifically,
First laser transmitter is equipped on the X-ray machine platform, the filtration turntable is equipped with the first mark position, first mark
Remember that position is arranged among two neighboring optical filtering hole, when the laser of first laser transmitter transmitting is penetrated in the filtration turntable
The first mark position when, added filtration piece is in working position, at this time added filtration piece center and X-ray Exit positions exist
The same horizontal position；The turntable is equipped with second laser transmitter, and the filtration turntable is equipped with the second mark position, when
The laser of second laser transmitter transmitting penetrates added filtration piece center and ionization in the second mark position of the filtration turntable
The reception ray position of chamber device is in the same horizontal position, to realize the reception ray position and added filtration of ionisation-chamber arrangements
Piece center, X-ray machine X-ray Exit positions on same straight line；
The X-ray machine generates primary x-ray beam；
The primary x-ray beam filters out the ray lower than first threshold energy after added filtration piece；
The ionisation-chamber arrangements receives filtered X-ray beam, and the filtered X-ray beam makes in the ionisation-chamber arrangements
Air ionizes, and generates ionization current；
Electrometer detects ionization current, obtains ionization current values.
2. the detection method according to claim 1 based on ionization chamber system, which is characterized in that the filtering device has
Turntable is filtered, it includes N number of optical filtering hole that the filtration turntable, which is equipped with, and the N is the positive integer greater than 1, and the added filtration piece is inserted
It is connected in the optical filtering hole；The filtration turntable is driven by filtration rotating electric machine；
It is described to adjust the filtering device specifically: the filtration rotating electric machine receives filtration rotating signal, drives the filtration
Turntable rotation drives the added filtration piece of the filtration turntable to rotate to working position.
3. the detection method according to claim 1 based on ionization chamber system, which is characterized in that the first guide rail packet
It includes: fixed platform, two sliding rails, the first sliding block and lead screw；
Two sliding rails are arranged in parallel in the fixed platform；The lead screw is set among two sliding rails, and is put down
Row is in two sliding rails；First sliding block is set on the lead screw and is connected with the bottom of first base；
The control first motor drives the first base to move to operating position on the first guide rail specifically: described first
Motor receives the first displacement signal, and the lead screw is driven to rotate, and drives first sliding block along the guide screw movement to working position
It sets.
4. the detection method according to claim 1 based on ionization chamber system, which is characterized in that in the electrometer to electricity
After being detected from electric current, the detection method further include: change the intensity and average energy of the primary x-ray beam, then
It is secondary to be detected.
5. the detection method according to claim 2 based on ionization chamber system, which is characterized in that in the electrometer to electricity
After being detected from electric current, the detection method further include: rotate the filtration turntable, replacement is in the additional filter of working position
Piece is crossed, is detected again.
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| CN107144220A (en) * | 2017-06-10 | 2017-09-08 | 苏州康鸿智能装备股份有限公司 | A kind of dot laser measuring table |
| CN108195854A (en) * | 2017-12-26 | 2018-06-22 | 中国计量科学研究院 | A kind of X ray air attenuation coefficient detection method |
| CN109765291A (en) * | 2019-03-08 | 2019-05-17 | 陕西科技大学 | Paper total ash and component rapid measurement device and measurement method based on filter method |
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