CN105700001B - Shield component and ray incident angle measurement method for gamma ray radiator orientation survey - Google Patents
Shield component and ray incident angle measurement method for gamma ray radiator orientation survey Download PDFInfo
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- CN105700001B CN105700001B CN201410687144.9A CN201410687144A CN105700001B CN 105700001 B CN105700001 B CN 105700001B CN 201410687144 A CN201410687144 A CN 201410687144A CN 105700001 B CN105700001 B CN 105700001B
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Abstract
The invention belongs to radiometric technique fields, and in particular to a kind of shield component and ray incident angle measurement method for gamma ray radiator orientation survey.Shield component includes the shielding bucket of cover on the measurement probe, the shielding bucket uses the material for having larger mass attentuation coefficient to gamma-rays, wherein, the top of the shielding bucket is solid cylinder structure, lower part is hollow diagonal member circle of contact rod structure, it is in isosceles triangle after the hollow diagonal member circle of contact rod structure expansion, measuring probe is located inside hollow beveling cylindrical structure.The measurement method combines a kind of automatic algorithm for deducting background, can quickly determine the position of the radiant heat zone in radioactive source or nuclear terrorism, avoid the harm as caused by radioactivity as far as possible, while can also reduce dosage suffered by operating personnel.
Description
Technical field
The invention belongs to radiometric technique fields, and in particular to a kind of shield group for gamma ray radiator orientation survey
Part and ray incident angle measurement method.
Background technique
Today that core science and technology is grown rapidly, radioactive source are used widely in fields such as industrial or agricultural, scientific research, medicine.But
It is used, in storing process in radioactive source, the event for losing radioactive source occurs again and again, brings the negative shadow such as fear to the public
It rings.Therefore, radioactivity place is retired, long-range radioactivity condition evaluation, decontamination place increased radioactivity, nuclear accident scene are met an urgent need
Especially when nuclear terrorism, the quick positioning of radioactive source and its accurate of activity measure to become and detect, evaluate radiation
The key of influence.Meanwhile the monitoring data will also control the decision for alleviating action and urgent radiation protection action for nuclear accident and mention
For foundation.
Currently, most of Neutron Ambient Dose Equivalent monitor and personal dose equivalent monitor cannot all accurately determine radiation
The position in source, for traditional radioactive source search, often artificial carrying radiation seeks survey instrument and searches radioactive source or contaminated on foot
Region, this will cause, and detection person works' time is long, and Search Area is big, to increase dose of radiation suffered by operating personnel.
Summary of the invention
The purpose of the present invention is to provide a kind of can change in gamma ray radiator orientation survey the transverse direction of detector respectively to
The shield component of the same sex, and further provide for a kind of side that the measurement of ray incident angle is carried out using the shield component
Method.
Technical scheme is as follows: a kind of shield component for gamma ray radiator orientation survey, including covers on survey
Shielding bucket on amount probe, the shielding bucket use the material for having larger mass attentuation coefficient to gamma-rays, wherein the shielding
The top of bucket is solid cylinder structure, and lower part is hollow diagonal member circle of contact rod structure, the hollow diagonal member circle of contact column
It is in isosceles triangle after structure expansion, measuring probe is located inside hollow beveling cylindrical structure.
Further, it is used for the shield component of gamma ray radiator orientation survey as described above, wherein outside the shielding bucket
Equipped with the outer cover for having smaller mass attentuation coefficient to gamma-rays；Shielding bucket and outer cover are connected with top fixture respectively, outside
The lower part of cover connects pedestal.
Further, be used for the shield component of gamma ray radiator orientation survey as described above, wherein the pedestal with
Catching device is connected, and the catching device is connected to outer cover.
Further, it is used for the shield component of gamma ray radiator orientation survey as described above, wherein at the top
Fixed device is equipped with handle.
Further, it is used for the shield component of gamma ray radiator orientation survey as described above, wherein the shielding bucket
It is made of metal, the outer cover is made of organic glass or plastics, and the pedestal and top fixture are by steel alloy
It is made.
A kind of ray incident angle measurement method carrying out gamma ray radiator orientation survey using above-mentioned shield component, including
Following steps:
(S1) measuring probe being connected with data-acquisition system is placed in shield component, selects a reference point,
Measure the full energy peak counting rate A at this；
(S2) successively the shielding bucket of rotating shield component three times, is rotated by 90 ° in same direction every time, and measurement obtains respectively
Full energy peak counting rate B, C, D of three positions；
(S3) full energy peak counting rate A, B, C, the D for obtaining measurement substitute into following ratiometer formula, and ratio R is calculated
Value, R=(A-C)/(B-D)；
(S4) according to the relationship of R value and ray incidence angle in Fig. 3, interpolation calculation is carried out, incident angle θ value is sought；
(S5) size of B and D are judged, if B > D, θ value are the incident angle of ray；If B < D, θ value add
180 ° of incident angles for ray.
Beneficial effects of the present invention are as follows: the present invention is on existing ф 76.2mm × 76.2mm NaI (Tl) probe basis
On, change it to the transversely isotropic response of gamma-rays, devises a kind of shield novel, easy, shape is special
Component.The component greatly changes ф 76.2mm × 76.2mm NaI (Tl) probe to gamma-rays directional response characteristic, and combines
A kind of algorithm of automatic deduction background, the algorithm do not have dependence to energy of γ ray, can quickly determine radioactive source or core
The position of radiant heat zone in terrorist incident avoids the harm as caused by radioactivity as far as possible, while can also reduce operating personnel institute
By dosage.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of shield component in the embodiment of the present invention；
Fig. 2 is the attachment structure schematic diagram that bucket and outer cover are shielded in shield component；
Fig. 3 is the function relation figure of R value and gamma-rays incident angle；
Fig. 4 is the method flow diagram that the measurement of ray incident angle is carried out using shield component of the invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
Shield component novel, easy, that shape is special provided by the present invention includes 3 parts: to gamma-rays matter
Measure the biggish special shielding bucket of attenuation coefficient, to the lesser outer cover of gamma-rays mass attentuation coefficient and the shielding bucket, outer cover
Connection catching device.As shown in Figure 1, shielding bucket 1 cover is on the measurement probe, outer cover 2 is set, shielding bucket 1 and outer outside shielding bucket 1
Cover 2 is connected with top fixture 3 respectively, and the lower part of outer cover 2 connects pedestal 4, and pedestal 4 is connected with catching device 5, described
Catching device 5 is connected to outer cover 2, and top fixture 3 is equipped with handle 6.
The special shielding bucket biggish to gamma-rays mass attentuation coefficient, as shown in Figure 2, the bucket is by a filled circles
Column structure 11 and a hollow diagonal member circle of contact rod structure 12 form, and hollow diagonal member circle of contact rod structure expanded view is etc.
Lumbar triangle shape.The shielding bucket can greatly change ф 76.2mm × 76.2mm NaI (Tl) probe to gamma-rays transverse direction side
To response characteristic, and then it can determine the position of the radiant heat zone in radioactive source or nuclear terrorism.
Described as shown in Figure 2 to the lesser outer cover of gamma-rays mass attentuation coefficient, which is a thickness and height
The material of moderate hollow cylinder, barrel is smaller to gamma-rays attenuation coefficient while can also support the shielding bucket.
The top fixture 3 of shield component is connected by screw with the shielding bucket 1 and the outer cover 2；?
Hand 6 links together also by screw and the top fixture 3.
The solid cylinder structure 11 and hollow beveling cylindrical structure 12 for shielding bucket 1 are made of metal.
Outer cover 2 is made of organic glass or plastic products.
Pedestal 4 is made of steel alloy.
Top fixture 3 is made of steel alloy.
Screw is steel alloy screw.
Handle 6 is plastic products.
When no shield component, ф 76.2mm × 76.2mm NaI (Tl) probe is to gamma-rays laterally respectively to same
Property, normalization full energy peak counting rate will not change as ray incident angle changes；When adding the shield component, normalize
With the change of ray incident angle variation sharply occurs for full energy peak counting rate, i.e. this probe can only compare side's response
Obviously.In this way, every 90 ° of rotation lead screen layers, while measuring full energy peak counting rate at this time in a fixed point, measuring four altogether
Secondary, each time of measuring is identical, records each measurement position full energy peak counting rate, is denoted as A, B, C, D.It was measured every time
Cheng Zhong defines ratiometer formula R=(A-C)/(B-D), so that background mutually be supported to not have to deduct background
Disappear.When radioactive source is in different directions incidence, just there is different R values, i.e. it is to penetrate that R value is related to gamma-ray incident direction
One function of line incidence angle.Finally according to the incident direction of the available ray of function expression, so that it is determined that radioactive source
Position.
During determining the position of the radiant heat zone in radioactive source or nuclear terrorism, method of the invention introduces one
A specific response function R characterizes the angular response of described device.The R function concrete form is as follows:
(1) angle, θ added with lead screen model detector probe and ENERGY E respective function are S=(θ, E), then each phase
Poor 90 ° of angular energy respective function are as follows:
A=S (+0 ° of θ, E), B=S (+90 ° of θ, E), C=S (+180 ° of θ, E), D=S (+270 ° of θ, E)；
(2) above-mentioned A, B, C, D are brought into special ratio calculation function R (θ, E)=(A-C)/(B-D), i.e. R=
[(S (+0 ° of θ, E)-S (+180 ° of θ, E)]/[(S (+90 ° of θ, E)-S (+270 ° of θ, E)] can export R and angle, θ and ENERGY E
Relationship, it is specific as shown in Figure 3；
In addition, the R function can deduct background automatically, does not both have to special measurement background, has greatly shortened the activity duration,
Reduce dose of radiation suffered by operating personnel；Simultaneously to energy of γ ray do not have according to lazyness, i.e., to 661keV, 1173keV with
And the gamma-rays of the different-energies such as 1332keV, R value remain unchanged, and ensure that the practicability of device.
ф 76.2mm × 76.2mm NaI (Tl) probe catching device 5 is based on ф 76.2mm × 76.2mm NaI (Tl)
The size of probe and design, be capable of fixing shield component described in the probe and support, furthermore the catching device lower part
Angle value is indicated simultaneously, convenient for determining gamma ray radiator or radiant heat zone position.
Embodiment
Gamma ray radiator or a kind of specific implementation design method of radiant heat zone positioning, including shield component, ф
76.2mm × 76.2mm NaI (Tl) probe catching device, ф 76.2mm × 76.2mm NaI (Tl) probe, power supply and data
Acquisition system.
ф 76.2mm × 76.2mm NaI (Tl) probe is placed in catching device, then by the shield component cover
On ф 76.2mm × 76.2mm NaI (Tl) probe, probe and data-acquisition system are connected, power supply is opened, determines special sound
Answer the angle, θ relational expression R (θ) of R function Yu radioactive source position.
Survey meter is placed on one point, selects a reference point, measure the full energy peak at this by actual measurement process such as Fig. 4
Counting rate A, then as datum mark, 90 ° of lead screen layer are successively rotated clockwise, total corotating 3 times can obtain 3 positions
Full energy peak counting rate B, C, D.Measurement obtains four position full energy peak counting rates i.e. A, B, C, D and brings R=(A-C)/(B-D), root into
Above-mentioned R value is subjected to interpolation calculation according to Fig. 3, θ value can be solved.Then judge the size of above-mentioned B and D, if B > D, the θ that solves
Be exactly the incident angle of ray, if B < D, θ plus 180 ° be exactly ray incidence angle.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of shield component for gamma ray radiator orientation survey, the shielding bucket (1) including cover on the measurement probe is described
Shielding bucket (1) is using the material for having larger mass attentuation coefficient to gamma-rays, it is characterised in that: the top of shielding bucket (1)
For solid cylinder structure (11), lower part is hollow diagonal member circle of contact rod structure (12), the hollow diagonal member circle of contact column
It is in isosceles triangle after structure (12) expansion, it is internal that measuring probe is located at hollow beveling cylindrical structure (12).
2. being used for the shield component of gamma ray radiator orientation survey as described in claim 1, it is characterised in that: the shielding
Bucket (1) is externally provided with to the lesser outer cover of gamma-rays mass attentuation coefficient (2)；Shielding bucket (1) and outer cover (2) are fixed with top respectively
Device (3) is connected, and the lower part of outer cover (2) connects pedestal (4).
3. being used for the shield component of gamma ray radiator orientation survey as claimed in claim 2, it is characterised in that: the pedestal
(4) it is connected with catching device (5), the catching device (5) is connected to outer cover (2).
4. being used for the shield component of gamma ray radiator orientation survey as claimed in claim 2, it is characterised in that: on the top
Portion fixed device (3) is equipped with handle (6).
5. being used for the shield component of gamma ray radiator orientation survey as claimed in claim 3, it is characterised in that: the shielding
Bucket (1) is made of metal, and the outer cover (2) is made of organic glass or plastics, the fixed dress of the pedestal (4) and top
(3) are set to be made of steel alloy.
6. a kind of ray for carrying out gamma ray radiator orientation survey using shield component described in any one of claim 1-5
Incident angle measurement method, includes the following steps:
(S1) measuring probe being connected with data-acquisition system is placed in shield component, selects a reference point, measured
Full energy peak counting rate A at this；
(S2) successively the shielding bucket of rotating shield component three times, is rotated by 90 ° in same direction every time, and measurement obtains three respectively
Full energy peak counting rate B, C, D of position；
(S3) full energy peak counting rate A, B, C, the D for obtaining measurement substitute into following ratiometer formula, and ratio R value, R=is calculated
(A-C)/(B-D)；
(S4) interpolation calculation is carried out according to the functional relation of R value and ray incidence angle, finds out x-ray angle θ value；
(S5) size of B and D are judged, if B > D, θ value are the incident angle of ray；If B < D, θ value add 180 °
For the incident angle of ray.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687144.9A CN105700001B (en) | 2014-11-25 | 2014-11-25 | Shield component and ray incident angle measurement method for gamma ray radiator orientation survey |
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| CN105700001A CN105700001A (en) | 2016-06-22 |
| CN105700001B true CN105700001B (en) | 2019-03-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108572387B (en) * | 2017-03-07 | 2023-07-14 | 中国辐射防护研究院 | Calibration method of body source measurement detector |
| CN112882080A (en) * | 2020-09-15 | 2021-06-01 | 中国辐射防护研究院 | Rapid measurement method for gamma nuclide radioactive source orientation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101957226B (en) * | 2010-09-29 | 2012-09-19 | 上海辉博自动化仪表有限公司 | Passive nuclear material level measurement device |
| CN102509568A (en) * | 2011-10-13 | 2012-06-20 | 云南电力试验研究院(集团)有限公司 | Field X-ray protection method and protection device thereof |
| CN102590877B (en) * | 2012-01-16 | 2014-04-23 | 成都理工大学 | Directional gamma energy spectrum detection technology of underground tunnel |
| CN203732632U (en) * | 2014-02-21 | 2014-07-23 | 四川大学 | Dielectric material dielectric coefficient microwave measuring probe and measuring device composed of the same |
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