CN106597516B - A kind of design method of width dynamic range radioactive substance non-destroyed measurement system - Google Patents
A kind of design method of width dynamic range radioactive substance non-destroyed measurement system Download PDFInfo
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- CN106597516B CN106597516B CN201710003632.7A CN201710003632A CN106597516B CN 106597516 B CN106597516 B CN 106597516B CN 201710003632 A CN201710003632 A CN 201710003632A CN 106597516 B CN106597516 B CN 106597516B
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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
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/202—Measuring radiation intensity with scintillation detectors the detector being a crystal
Abstract
The invention belongs to radioactive substance non-destroyed measurement technical fields, disclose a kind of design method of wide dynamic range radioactive substance non-destroyed measurement system.The design method is using the activity variation range lower limit of object to be measured as design considerations, by placing cascade wedge shield or integrated wedge shield between detector and sample container, it is target, setting collimation hole depth, collimation hole width, collimating aperture height, promotion or single shield number of decline or the specific distance of promotion or decline according to object activity discreet value to be measured and reduced activity magnitude.This method can be realized simply and effectively in the larger range ability of needs, and the quantitative limit of the dead time rate of spectrometer system and detection system is maintained in a zone of reasonableness.
Description
Technical field
The invention belongs to radioactive substance non-destroyed measurement technical fields, and in particular to a kind of width dynamic range radioactivity
The design method of substance non-destroyed measurement system.
Background technique
(activity of measurement gamma activity substance, measurement pair are such as frequently necessary in the non-destroyed measurement of radioactive substance
As being typically placed in special container), it is very big that sample radioactive activity range spans can be encountered, or even differ several numbers
The case where magnitude, (quality of such as spent fuel reprocessing process process links controls and the crucial measurement of nuclear material accountancy control
Point).
Using existing conventional detection design of measuring system thinking, if being to set with sample activity variation range lower limit
Foundation is counted, then measuring system can face spectrometer system dead time rate superelevation and lead to measurement result deviation under high activity situation
Excessive problem；If the quantitative limit of detection system can mention therewith using the sample activity variation range upper limit as design considerations
It is high and lose the sensitive reaction to low-activity, while being necessarily required to correspondingly increase time of measuring.Therefore, it is badly in need of a kind of width now
Range measuring system, to adapt to the quantitative measurment demand of the possible wide variation of measurement object radioactive activity.
Summary of the invention
(1) goal of the invention
According to problem of the existing technology, this application provides one kind simply and effectively to realize in the larger of needs
In range ability, the measurement system that the quantitative limit of the dead time rate of spectrometer system and detection system is maintained in a zone of reasonableness
The design method of system.
(2) technical solution
A kind of design method of width dynamic range radioactive substance non-destroyed measurement system, which includes following
Step：
(1) detector is placed in the first support construction；Spectrometer is connected by dedicated connection with detector, spectrometer or
It is placed in the first support construction or far from the first support construction；The sample container for containing radioactive substance is placed on second
On support structure, radioactive substance to be measured is as object to be measured, using the activity variation range lower limit of object to be measured as design considerations；
(2) shield is placed between detector and sample container, which is cascade wedge shield；Wherein visit
It surveys device and shield is located in a cask flask, the side of the cask flask face object to be measured is provided with collimating aperture；
(3) with object radioactive activity discreet value to be measured, the magnitude of activity to be reduced and the volume of radioactive substance to be measured
Setting collimation hole depth, collimation hole width and collimating aperture height；
(4) bigness scale is carried out to object to be measured, according to the meter mathematical statistics for the particular energy gamma ray that spectrometer obtains
And dead time rate, adjustment collimation hole depth；
(5) accurate measurement is implemented to object to be measured, according to the meter mathematical statistics for the particular energy gamma rays that spectrometer obtains
And measurement result is obtained by calculating；
The cascade wedge shield is made of multiple single shields, and each list shield connects with elevating mechanism respectively
It connects, to realize the promotion or decline of single shield, and the controllable specific distance promoted or decline；It is pre- according to object activity to be measured
Valuation and reduced activity magnitude are target, and setting is promoted or single shield number of decline, according to the sample of object to be measured
Height setting is promoted or the specific distance of decline.
Preferably, the shield can also be integrated wedge shield；It is described integration wedge shield be
Integration, stepped shield, integrated wedge shield top are connect with elevating mechanism, realize integrated wedge screen
The whole of body is covered to be promoted or declined；It is target according to the radioactive activity discreet value of object to be measured and reduced activity magnitude,
The height that integrated wedge shield is promoted or declined is set.
Preferably, collimating aperture is arranged as target using the magnitude of the activity discreet value of radioactive substance to be measured, activity to be reduced
Depth；It is collimation width with the diameter of sample container；It is maximum collimation height with the height of sample container.
Preferably, first support construction is fixed or lift；Second support construction is the knot of liftable, rotation
Structure；Height by adjusting the first support construction, the second support construction makes collimating aperture height meet measurement request and makes collimating aperture
It is directed at object to be measured.
Preferably, the material of the shield is lead or tungsten ferronickel.
Preferably, the elevating mechanism is connect with controller, realizes remote operation.
Preferably, the shape of single shield is cuboid-type.
Preferably, the detector is NaI detector.
(3) beneficial effect
Wide-range radioactive substance is measured using design method provided by the present application, have it is easy to operate, can
By in the range ability of needs, the quantitative limit of the dead time rate of spectrometer system and detection system is maintained at a zone of reasonableness
Interior beneficial effect.And the system of traditional measurement radioactive substance its collimate depth and width often fixed nonadjustable, pole
Time rate superelevation is even overflow on one's deathbed for spectrometer system meet under easily occurring using activity lower limit as the high activity situation of design considerations bring
Out the problem of.Passed through using design method provided by the present application using object activity variation range lower limit to be measured as design considerations
Rationally setting cascade wedge shield, integrated wedge shield decline number (corresponding collimation hole depth) or height is then
The defect is efficiently solved, can be used for the measurement of gamma activity substance in different range-of-motions.
Detailed description of the invention
Fig. 1 be shield be cascade wedge shield when measuring system schematic diagram；Wherein 1 is detector；2 be spectrum
Instrument；3 be the first support construction；4 be the second support construction；5 be elevating mechanism；8 be cascade wedge shield；7 be that sample holds
Device；9 be cask flask；10 be collimating aperture.
The measuring system schematic diagram that Fig. 2 is shield when being integrated wedge shield；Wherein 6 be integrated wedge
Shield.
Specific embodiment
The application is further elaborated below in conjunction with specification drawings and specific embodiments.
Embodiment 1
A kind of design method of width dynamic range radioactive substance non-destroyed measurement system, which includes following
Step：
(1) to be measured to put as shown in Figure 1, the sample container for containing radioactive substance is placed in the second support construction 4
Penetrating property substance is as object to be measured, using the activity variation range lower limit of object to be measured as design considerations；Gamma detector 1 is placed on
In first support construction 3；Spectrometer 2 is connected by dedicated connection with detector 1, spectrometer 2 or is placed in the first support construction 3
Or far from the first support construction 3；First support construction 3 is stationary structure, and the second support construction 4 is liftable, rotation
Structure；Height by adjusting the first support construction 3, the second support construction 4 makes the height of collimating aperture 10 meet measurement request
And collimating aperture is made to be directed at object to be measured；
(2) shield is placed between detector 1 and sample container 7, which is cascade wedge shield 8；Its
Middle detector 1 and cascade wedge shield 8 are located in a cask flask 9, the side of 9 face of the cask flask object to be measured
It is provided with collimating aperture 10；The material of the cascade wedge shield 8 is tungsten ferronickel；
(3) collimating aperture 10 is arranged as target using the magnitude of the activity discreet value of radioactive substance to be measured, activity to be reduced
Depth；It is collimation width with the diameter of sample container 7；It is maximum collimation height with the height of sample container 7.
(4) bigness scale is carried out to object to be measured, according to the meter mathematical statistics for the particular energy gamma ray that spectrometer obtains
And dead time rate, adjustment collimation hole depth；
(5) accurate measurement is implemented to object to be measured, according to the meter mathematical statistics for the particular energy gamma rays that spectrometer obtains
And measurement result is obtained by calculating；
The cascade wedge shield 8 is made of multiple single shields, and each list shield connects with elevating mechanism 5 respectively
It connects, to realize the promotion or decline of single shield, and the controllable specific distance promoted or decline；It is pre- according to object activity to be measured
Valuation and reduced activity magnitude are target, and setting is promoted or single shield number of decline, according to the sample of object to be measured
Height setting is promoted or the specific distance of decline.
The group water solution containing Cs-137 is measured using the detection system that the application designs.The quilt of solution containing Cs-137
It is placed in the cylindrical receptacle of diameter 1cm, when solution capacity is 1ml, height of specimen is about 1.27cm.
Detector selects the NaI detector of 3 inches of (diameter and length be 7.62cm).Shield material selection density
For 18.7g/cm3Tungsten ferronickel, be arranged detector receiving surface with sample axis at a distance from be 7.1cm, collimation height be 1.27cm, standard
Straight width is 1cm, single shield with a thickness of 1.3cm, when shield all leaves collimating channel, every transmitting one
0.661MeV photon, detector average counter rate are 1.34485e-3, and when putting next single shield, average counter rate will become
1.4712e-4, single shield under type discharge, average counter rate will become 1.6314e-5,1.8910e-6,3.54e-7 and
1.97e-7.It is achieved that according to above-mentioned calculated result (being tested in conjunction with actual measurement appropriate) and 5 is reached to activity variation range
The effective quantitative measurment of object implementatio8 to be measured of magnitude, the single shield of every decline one, is adapted to activity and improves a magnitude
Object to be measured.
Embodiment 2
Unlike the first embodiment, as shown in Fig. 2, first support construction 3 is lifting structure；The shield
Material be lead.The shield can also be integrated wedge shield 6；The integration wedge shield 6 is one
Body, stepped shield, integrated 6 top of wedge shield are connect with elevating mechanism 5, realize integrated wedge screen
The whole of body 6 is covered to be promoted or declined；It is target according to the radioactive activity discreet value of object to be measured and reduced activity magnitude,
The height that integrated wedge shield 6 is promoted or declined is set.The elevating mechanism 5 is connect with controller, realizes long-range behaviour
Make.The shape of the list shield is cuboid-type.
Claims (8)
1. a kind of design method of width dynamic range radioactive substance non-destroyed measurement system, which is characterized in that the design side
Method includes the following steps：
(1) detector is placed in the first support construction；Spectrometer is connected by dedicated connection with detector, spectrometer or placement
In the first support construction or far from the first support construction；The sample container for containing radioactive substance is placed on the second support knot
On structure, radioactive substance to be measured is as object to be measured, using the activity variation range lower limit of object to be measured as design considerations；
(2) shield is placed between detector and sample container, which is cascade wedge shield；Wherein detector
It is located in a cask flask with shield, the side of the cask flask face object to be measured is provided with collimating aperture；
(3) it is arranged with the volume of the magnitude and radioactive substance to be measured of object radioactive activity discreet value to be measured and activity to be reduced
Collimate hole depth and collimation hole width and collimating aperture height；
(4) to object to be measured carry out bigness scale, according to spectrometer obtain particular energy gamma ray meter mathematical statistics and
Dead time rate, adjustment collimation hole depth；
(5) accurate measurement is implemented to object to be measured, the meter mathematical statistics of the particular energy gamma rays obtained according to spectrometer simultaneously lead to
It crosses calculating and obtains measurement result；
The cascade wedge shield is made of multiple single shields, and each list shield is connect with elevating mechanism respectively, with
Realize the promotion or decline of single shield, and the controllable specific distance promoted or decline；According to object activity discreet value to be measured
It is target with reduced activity magnitude, setting is promoted or single shield number of decline, according to the height of specimen of object to be measured
The specific distance for being promoted or being declined is set.
2. design method according to claim 1, which is characterized in that the shield can also be integrated wedge screen
Cover body；The integration wedge shield is integration and stepped shield, above integrated wedge shield with
The whole promotion or decline of integrated wedge shield are realized in elevating mechanism connection；According to the radioactive activity of object to be measured
Discreet value and reduced activity magnitude are target, and the height that integrated wedge shield is promoted or declined is arranged.
3. design method according to claim 1, which is characterized in that be with the work of radioactive substance to be measured in step (3)
The magnitude for spending discreet value and activity to be reduced is target setting collimation hole depth；It is collimation width with the diameter of sample container；With
The height of sample container is maximum collimation height.
4. design method according to claim 1, which is characterized in that first support construction is fixed or lifting
Formula；Second support construction is the structure of liftable and rotation；By adjusting the height of the first support construction and the second support construction
So that collimating aperture height is met measurement request and collimating aperture is made to be directed at object to be measured.
5. design method according to claim 1, which is characterized in that the material of the shield is lead or tungsten ferronickel.
6. design method according to claim 1, which is characterized in that the elevating mechanism is connect with controller, is realized remote
Journey operation.
7. design method according to claim 1, which is characterized in that the shape of the list shield is cuboid-type.
8. design method according to claim 1, which is characterized in that the detector is NaI detector.
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| CN201710003632.7A CN106597516B (en) | 2017-01-04 | 2017-01-04 | A kind of design method of width dynamic range radioactive substance non-destroyed measurement system |
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| CN201710003632.7A CN106597516B (en) | 2017-01-04 | 2017-01-04 | A kind of design method of width dynamic range radioactive substance non-destroyed measurement system |
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| CN106597516B true CN106597516B (en) | 2018-11-30 |
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| CN110186941B (en) * | 2019-05-16 | 2024-03-19 | 中国人民大学 | Neutron analyzer shielding device and adjusting method thereof |
| CN112630815B (en) * | 2020-10-13 | 2023-09-29 | 中国原子能科学研究院 | Radioactivity detection system and measurement method for detector |
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| JP2001153956A (en) * | 1999-11-25 | 2001-06-08 | Hitachi Ltd | Apparatus for measuring radioactivity concentration of gas |
| CN2484558Y (en) * | 2001-01-19 | 2002-04-03 | 成都中核新材料股份有限公司 | Soft-ray perspective inspection tester |
| US6791091B2 (en) * | 2001-06-19 | 2004-09-14 | Brian Rodricks | Wide dynamic range digital imaging system and method |
| CN100545641C (en) * | 2004-04-03 | 2009-09-30 | 宋世鹏 | A kind of ray detecting device |
| US7498582B2 (en) * | 2006-03-22 | 2009-03-03 | Siemens Medical Solutions Usa, Inc. | Adjustable focal length pinhole collimator |
| CN201868118U (en) * | 2010-11-15 | 2011-06-15 | 东软飞利浦医疗设备系统有限责任公司 | X-ray collimator |
| CN202494652U (en) * | 2012-03-14 | 2012-10-17 | 中国原子能科学研究院 | Transmission source collimation shield |
| JP6592939B2 (en) * | 2015-04-01 | 2019-10-23 | 富士電機株式会社 | Radioactivity measuring device |
| CN204705601U (en) * | 2015-07-01 | 2015-10-14 | 原子高科股份有限公司 | Iodine 131 diagnosis capsule activity meter |
| CN105785419A (en) * | 2016-04-19 | 2016-07-20 | 成都新核泰科科技有限公司 | Water body radioactivity measuring device and measuring method |
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