CN109239757A - A kind of measurement of flash gamma radiation dose response function and diagnostic device and method - Google Patents
A kind of measurement of flash gamma radiation dose response function and diagnostic device and method Download PDFInfo
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- CN109239757A CN109239757A CN201811168588.6A CN201811168588A CN109239757A CN 109239757 A CN109239757 A CN 109239757A CN 201811168588 A CN201811168588 A CN 201811168588A CN 109239757 A CN109239757 A CN 109239757A
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Abstract
The invention discloses a kind of measurements of flash gamma radiation dose response function and diagnostic device and method, the side of scattering target is arranged in high-current accelerator, collimation shielding harness is arranged in above the other side of scattering target, the setting of pinhole photography system is in collimation shielding harness, pinhole photography System Back-end is provided with IP imaging plate, the setting of cave system is captured outside collimation shielding harness, close to IP imaging plate.The present invention quickly can provide accurate flash gamma radiation field intensity distribution parameter for a variety of application studies experiment, parameter needed for flash physical process diagnoses is provided for the generation of flash radiation environment, the time for obtaining this parameter and human cost will be greatly reduced, it can guarantee that a variety of application study experiments are gone on smoothly, flash radiation environment analogue technique level promoted to improve.
Description
Technical field
The invention belongs to experimental technique fields, and in particular to a kind of flash gamma radiation dosage that high-current accelerator generates
The measurement and diagnostic device and method of field intensity distribution.
Background technique
Flash gamma radiation dosage field intensity distribution measurement is the big event of flash radiation environment diagnosis, accurate fast
Dose response function information is obtained fastly, is effective premise for carrying out high dose rate effect experiment；When due to flash gamma radiation
Between short (~100ns), high (dosage rate~10 of intensity9(SI) Gy/s), conventional radiation detector can not be measured directly, mesh
The preceding dosage field intensity distribution for generalling use Annual dose measurement flash gamma radiation both at home and abroad.
The measurement of flash gamma radiation dose response function is with diagnosis urgent problem to be solved:
1, the radiation areas that flash radiation generates are big, diameter about Φ 9cm, area about 80cm2, and repeatability is poor, often
Changes will occur for secondary radiation regional location and intensity, in the several thousand experiments completed, each impulse radiation field intensity
Distribution is all different, it is necessary to which the dosage field intensity distribution of flash radiation experiments each time is measured and diagnosed；
2, since target surface radiation field is in asymmetric distribution, it is necessary to which enough Annual dose forming arrays are to guarantee spoke
Field intensity distribution space resolving power is penetrated, Annual dose needs artificial quenching to read data, and time of measuring cost is too high；
3, Annual dose is easily broken in measurement process, and critical data is caused to lose；
4, electronics and neutron serious interference, while there is also strong electromagnetic, need to increase shielding to reduce to flash
The influence of measurement and diagnosis；
5, flash radiation field region can not provide more spaces to increase shielding, and increase shielding and will lead to strong arteries and veins
The environmental parameter for rushing radiation field region changes.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of flash gal
Horse dose of radiation field distribution measurement and diagnostic device and method, solution flash radiated time is short, intensity is high and uncertainty is big,
Dosage field areas is big and intensity distribution is random, a variety of KPT Scatter background serious interferences, electromagnetic interference are strong, measurement and diagnosis are available
The very limited problem in space.
The invention adopts the following technical scheme:
A kind of measurement of flash gamma radiation dose response function and diagnostic device, including high-current accelerator, scattering target, standard
The side of scattering target, collimation shielding is arranged in straight shielding harness, pinhole photography system and capture cave system, high-current accelerator
System is arranged in above the other side of scattering target, and the setting of pinhole photography system is in collimation shielding harness, after pinhole photography system
End is provided with IP imaging plate, and the setting of capture cave system is outside collimation shielding harness, close to IP imaging plate.
Specifically, scattering target is placed at 3~10cm of high-current accelerator anode target, and it is parallel with anode target, with ray
Shu Fangxiang is vertical.
Further, scattering target with a thickness of 0.1~3mm, be made of copper, aluminium, stainless steel or pmma material.
Specifically, scattering target is 50~100cm at a distance from collimation shielding harness.
Specifically, collimation shielding harness be composite construction, layer structure, stainless steel plate bracket including Boron-containing-PE with
And the endothecium structure of lead material.
Specifically, pinhole photography system from the inside to the outside successively include pin hole, shielded layer and stainless steel plate bracket, pin hole and
Shielded layer is all made of lead material and is made.
Specifically, high-current accelerator goes out the continuous spectrum that 0~10MeV is drawn at beam end, continuous spectrum is that flash radiates gamma light
Son, average energy 1.1MeV, equivalent dose coefficient are 4.33pGycm2。
A kind of measurement of flash gamma radiation dose response function and diagnostic method, utilize the flash gamma radiation agent
Measure field distribution measurement and diagnostic device, comprising the following steps:
S1, it is got on scattering target from the flash gamma radiation photon that high-current accelerator front end diode section is drawn, quilt
The gammaphoton of scattering target scattering deviates flash gamma radiation Shu Fangxiang；
S2, gammaphoton enter collimation shielding harness after being scattered target scattering, and gammaphoton flux declines 3~4 magnitudes,
The pin hole in shielding colimated light system is then passed through, in IP imaging plate sedimentary energy and forms latent image；
S3, the reconstruction of dosage field intensity distribution is carried out using non-negative linearity least square method；
S4, flash gamma radiation field dose response function is determined according to the reconstructed results of step S3.
Specifically, dividing source surface grids in step S3, entire grid PSF is substituted with the PSF of grid element center point, is used
MCNP, which is calculated, obtains space-variant PSF；Using MATLAB and LabView hybrid programming realize automatic mesh generation and PSF obtain and
Calculation processing, according to the two dimensional image of IP imaging plate, is rebuild after obtaining space-variant PSF using non-negative linearity least square method
Obtain the scattering gamma dosage field intensity distribution x at scattering target.
Further, QR decomposition is carried out to the matrix A of n × k, calculates the scattering gamma dosage field intensity distribution at scattering target
X is as follows:
Min | | Ax-b | |=min | | QRx-b | |=min | | Rx-Q-1b||
Wherein, b is the column vector of n × 1, and Q is n × k orthogonal matrix, and R is k × k upper triangular matrix.
Compared with prior art, the present invention at least has the advantages that
A kind of flash gamma radiation dose response function measurement of the present invention and diagnostic device, pinhole photography system is arranged in
Deviate in the multilayer material collimation shield of flash gamma radiation Shu Fangxiang, a variety of radiation background noises can be effectively reduced,
Electromagnetic interference is eliminated, the signal-to-noise ratio of IP imaging plate is improved, while available Experimental Area flash radiation environment not will cause greatly
Influence, can guarantee that the experimental studies such as high dose rate effect are normally carried out, thin scattering target scattering smaller portions high-current accelerator produces
Raw pulse beam gammaphoton；A variety of KPT Scatter backgrounds and electromagnetic interference can be effectively reduced in collimation shielding harness, improve
The signal-to-noise ratio of IP plate experiment imaging；Pinhole photography system can obtain the two dimensional image of experiment scattering gamma；Capture cave system energy
The KPT Scatter background into pinhole photography system is further decreased, the signal-to-noise ratio of IP plate experiment imaging is improved；IP imaging plate tool
There are high-quantum efficiency, Larger Dynamic range, good power spectrum linear response and high s/n ratio, simple operation and other advantages, is suitble to flat
The scattering of equal energy 1.1MeV gammaphoton carries out imaging measurement.
Further, the thin target of suitable material, size and thickness, gammaphoton are arranged at 3~10cm of beam end face out
Enter after thin target scatters and collimates shielding harness, gammaphoton flux 3~4 magnitudes of decline, about 2.31 × 1016cm-2s-1, thin
Target scattering measures again after reducing intensity, solves the problems, such as that impulse radiation intensity is high, is suitble to be measured and diagnosed with IP imaging plate.
Further, thin scattering target is arranged in the available finite region of high dose rate effect experiment, to scatter 3~10%
The pulse beam gammaphoton that high-current accelerator generates, to be measured to flash gamma ray dosage field intensity distribution,
Simultaneously big influence not will cause to available Experimental Area flash radiation field environment, can guarantee that high dose rate effect experiment is studied
It is normally carried out.
Further, the flash radiation feature that high-current accelerator generates under different working condition is different, needs needle
The scattering target of the materials and suitable thickness such as selection copper, aluminium, stainless steel or organic glass to property.
Further, the flash ray that high-current accelerator generates under different working condition not only has gamma, there are also in
Son and electronics, and neutron and electronic intensity are higher, the collimation shielding harness of composite construction can be used effective slowing down, absorption and reduce more
The influence of kind particle and scattering background to measurement.
Further, the pinhole photography system of composite shielding internal system reduces a variety of KPT Scatter background interference, improves
IP imaging plate tests imaging signal to noise ratio.
The invention also discloses a kind of measurement of flash gamma radiation dose response function and diagnostic methods, solve in flash
Radiated time is short, intensity is high and uncertainty is big, dosage field areas is big and intensity distribution is random, a variety of KPT Scatter background interference
Seriously, it under the extreme conditions such as electromagnetic interference is strong, measurement and diagnosis available space are very limited, fast and accurately realizes to flash
The problem of Radiation Dose Field intensity distribution measurement.
Further, source surface grids are divided, is rebuild to obtain at scattering target using non-negative linearity least square method
Gamma dosage field intensity distribution is scattered, is solved flash radiated time is short, intensity is high and uncertainty is big, dosage field areas is big
And intensity distribution is random, a variety of KPT Scatter background serious interferences, electromagnetic interference are strong, measurement with to diagnose available space very limited
Etc. under extreme conditions, fast and accurately realize the problem to flash Radiation Dose Field intensity distribution measurement.
In conclusion the present invention quickly can provide accurate flash gamma radiation field intensity for a variety of application studies experiment
Distribution parameter provides parameter needed for flash physical process diagnoses for the generation of flash radiation environment, will be greatly reduced and obtain this
The time of parameter and human cost, it is ensured that a variety of application study experiments are gone on smoothly, and flash radiation environment is promoted to simulate skill
Art level improves.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is schematic structural diagram of the device of the invention；
Fig. 2 is planar annular source and the image that MCNP SIMULATED SCATTERING gamma-rays pin-hole imaging obtains, wherein (a) is source figure
Picture is (b) analog image of scatteredγ-ray pin-hole imaging；
Fig. 3 is the source images reconstructed results of planar annular source scatteredγ-ray pin-hole imaging image, wherein (a) is the source 5x5
Surface grids divide, and (b) divide for the source 10x10 surface grids, (c) divide for the source 20x20 surface grids.
Wherein: 1. high-current accelerators；2. scattering target；3. collimating shielding harness；4.IP imaging plate；5. capturing cave system；6.
Pinhole photography system.
Specific embodiment
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
"front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " side ", " one end ", " one side " etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Referring to Fig. 1, a kind of measurement of flash gamma radiation dose response function of the present invention and diagnostic device, including high current plus
Fast device 1, scattering target 2, collimation shielding harness 3, pinhole photography system 6, IP imaging plate 4 and capture cave system 5, high-current accelerator
1 is arranged in the side of scattering target 2, and collimation shielding harness 3 is arranged in above the other side of scattering target 2, and pinhole photography system 6 is arranged
In the inside of collimation shielding harness 3, the end of pinhole photography system 6 is arranged in IP imaging plate 4, and capture cave system 5 is arranged in standard
The external side of straight shielding harness 3 can effectively reduce the influence scattered to imaging effect close to IP imaging plate 4.
Go out the continuous spectrum that the flash radiation gammaphoton drawn at beam end is 0~10MeV from flash accelerator, is averaged
Energy is 1.1MeV, and equivalent dose coefficient is 4.33pGycm2, calculate 1 × 109Gy (SI)/corresponding gammaphoton of s dosage rate is logical
Amount about 2.31 × 1020cm-2s-1；
The dose intensity that scattering target 2 scatters can measure reading scattering target 2 and dissipate in the range dynamic range of IP imaging plate 4
The off axis intensity distribution gray level image of gamma is penetrated,
2 selected materials of scattering target are copper, aluminium, stainless steel or organic glass, and the thickness of different materials is also different, from
0.1mm to 3mm is placed on apart from 1 3~10cm of anode target of high-current accelerator or so place, parallel with anode target, with beam direction
Vertically.
Collimation shielding harness 3 is composite construction, including Boron-containing-PE outer layer, stainless steel plate bracket and lead material internal layer.
Pinhole photography system 6 includes pin hole made of lead, and outside lead shielded layer, outermost is stainless steel plate bracket, after
Hold imaging plate material selection to the corresponding preferable IP imaging plate 4 of 1MeV gamma energy, pinhole photography system 6 and collimation shielding harness
3 are adapted to using lead material workpiece.According to the adjustable pin hole of high-current accelerator different working condition demand be diplopore, it is porous,
Labyrinth hole or annular aperture design.
Preferably, IP imaging plate can be changed to radiation conversion (radiation as detector) again plus total reflection mirror (or total reflection
Film) deflection, finally digitized greyscale value is realized with position sensitive photo-multiplier tube (PSPMT) or CCD camera.
A kind of flash gamma radiation dose response function measurement of the present invention and diagnostic method, using suitable method for reconstructing meter
Calculation obtains the dosage field intensity distribution at scattering target 2, due to the scattering gamma dosage field intensity distribution and flash at scattering target 2
The dosage field intensity distribution of gamma radiation field is consistent, and then can provide flash gamma radiation field dose response function, packet
Include following steps:
S1, it is got on scattering target 2 from the flash gamma radiation photon that 1 front end diode section of high-current accelerator is drawn,
The gammaphoton scattered by scattering target 2 deviates flash gamma radiation Shu Fangxiang；
S2, gammaphoton are scattered to enter the collimation shielding harness 3 at distance about 50~100cm, gamma light after target 2 scatters
3~4 magnitudes of sub- flux decline, about 2.31 × 1016cm-2s-1, then pass through shielding colimated light system 3 in thick pin hole, IP at
As 4 sedimentary energy of plate and form latent image；
S3, the reconstruction of dosage field intensity distribution is carried out using non-negative linearity least square method；
PSF is the basis of image rebuilding method, PSF it is accurate whether be the key factor for determining image reconstruction effect.It will
Source surface grids divide, and substitute entire grid PSF with the PSF of grid element center point, are calculated using MCNP and obtain space-variant PSF.It uses
MATLAB and LabView hybrid programming can realize automatic mesh generation and PSF is obtained and calculation processing, can after obtaining space-variant PSF
According to experiment IP plate two dimensional image, rebuild to obtain the scattering gamma agent at thin scattering target using non-negative linearity least square method
Measure field intensity distribution；
Scattering imaging problem reduction is as follows:
D=C*x
Wherein, d is as being distributed, and C is PSF matrix, and x is source distribution, and the basic mathematical expression formula of algorithm is as follows:
Least square method (also known as least squares method) is a kind of mathematical optimization techniques.It passes through the quadratic sum for minimizing error
Find the optimal function matching of data.Unknown data can be easily acquired using least square method, and these are acquired
Data and real data between error quadratic sum be minimum.
The matrix form of least square method are as follows:
Ax=b
Wherein, A is the matrix of n × k, and x is the column vector of k × 1, and b is the column vector of n × 1.
If n > k, the number of equation is greater than the number of unknown quantity, this equation system is known as inconsistent equation group (Over
Determined System)；
If n < k, the number of equation is less than the number of unknown quantity, this system is exactly Under Determined
System.From the point of view of normal, this equation is not solved, but in numerical arts, calculates min | | Ax-b | |, it solves wherein
Matrix x, more intuitive way is to solve for ATAx=ATB, but it is usually more inefficient.
It is as follows that the present invention carries out QR decomposition to the matrix A of n × k:
Min | | Ax-b | |=min | | QRx-b | |=min | | Rx-Q-1b||
Wherein, b is the column vector of n × 1, and Q is n × k orthogonal matrix, and R is k × k upper triangular matrix.
In MATLAB, the solution of matrix x can be very easily carried out, the matrix X solved is exactly the dosage at scattering target
Field intensity distribution.
The dosage field intensity distribution of scattering gamma dosage field intensity distribution and flash gamma radiation field at S4, thin target is
Consistent, the matrix x that least square method solves is exactly the reconstruction dosage field intensity distribution at scattering target, can be with according to reconstructed results
Provide flash gamma radiation field dose response function.
It can be provided by experimental calibration or scale between IP plate experiment imaging latent image sum of the grayscale values dosage field intensity in early period
Conversion coefficient.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Simulation defines a circumferentia source, and the photographic image that source images and simulation obtain is as shown in Figure 2；Reconstructed results are such as
Shown in Fig. 3, it can be seen that surface grids division in source is more, and reconstruction image more meets with source images.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (10)
1. a kind of flash gamma radiation dose response function measurement and diagnostic device, which is characterized in that including high-current accelerator
(1), scattering target (2), collimation shielding harness (3), pinhole photography system (6) and capture cave system (5), high-current accelerator (1)
Side in scattering target (2) is set, and collimation shielding harness (3) is arranged above the other side of scattering target (2), pinhole photography system
(6) in collimation shielding harness (3), pinhole photography system (6) rear end is provided with IP imaging plate (4) for setting, is captured cave system (5)
Setting is external in collimation shielding harness (3), close to IP imaging plate (4).
2. flash gamma radiation dose response function measurement according to claim 1 and diagnostic device, which is characterized in that dissipate
Shoot at the target (2) be placed at high-current accelerator (1) 3~10cm of anode target, it is parallel with anode target, it is vertical with beam direction.
3. flash gamma radiation dose response function measurement according to claim 2 and diagnostic device, which is characterized in that dissipate
Shoot at the target (2) with a thickness of 0.1~3mm, be made of copper, aluminium, stainless steel or pmma material.
4. flash gamma radiation dose response function measurement according to claim 1 and diagnostic device, which is characterized in that dissipate
Shoot at the target (2) at a distance from collimation shielding harness (3) for 50~100cm.
5. flash gamma radiation dose response function measurement according to claim 1 and diagnostic device, which is characterized in that quasi-
Straight shielding harness (3) is composite construction, the internal layer of layer structure, stainless steel plate bracket and lead material including Boron-containing-PE
Structure.
6. flash gamma radiation dose response function measurement according to claim 1 and diagnostic device, which is characterized in that needle
Hole photographic system (6) includes successively from the inside to the outside pin hole, shielded layer and stainless steel plate bracket, and pin hole and shielded layer are all made of lead
Material is made.
7. flash gamma radiation dose response function measurement according to claim 1 and diagnostic method, which is characterized in that strong
Flow accelerator goes out the continuous spectrum that 0~10MeV is drawn at beam end, and continuous spectrum is that flash radiates gammaphoton, and average energy is
1.1MeV, equivalent dose coefficient are 4.33pGycm2。
8. a kind of measurement of flash gamma radiation dose response function and diagnostic method, which is characterized in that using as claim 1 to
The measurement of flash gamma radiation dose response function described in any one of 7 and diagnostic device, comprising the following steps:
S1, it gets on scattering target, is scattered from the flash gamma radiation photon that high-current accelerator front end diode section is drawn
The gammaphoton of target scattering deviates flash gamma radiation Shu Fangxiang；
S2, gammaphoton enter collimation shielding harness after being scattered target scattering, and gammaphoton flux declines 3~4 magnitudes, then
Pin hole in shielding colimated light system, in IP imaging plate sedimentary energy and forms latent image；
S3, the reconstruction of dosage field intensity distribution is carried out using non-negative linearity least square method；
S4, flash gamma radiation field dose response function is determined according to the reconstructed results of step S3.
9. flash gamma radiation dose response function measurement according to claim 8 and diagnostic method, which is characterized in that step
In rapid S3, source surface grids are divided, entire grid PSF is substituted with the PSF of grid element center point, is calculated using MCNP and obtains the space-variant
PSF；Automatic mesh generation is realized using MATLAB and LabView hybrid programming and PSF is obtained and calculation processing, obtains space-variant
After PSF, according to the two dimensional image of IP imaging plate, rebuild to obtain the scattering at scattering target using non-negative linearity least square method
Gamma dosage field intensity distribution x.
10. flash gamma radiation dose response function measurement according to claim 9 and diagnostic method, which is characterized in that
QR decomposition is carried out to the matrix A of n × k, the scattering gamma dosage field intensity distribution x calculated at scattering target is as follows:
Min | | Ax-b | |=min | | QRx-b | |=min | | Rx-Q-1b||
Wherein, b is the column vector of n × 1, and Q is n × k orthogonal matrix, and R is k × k upper triangular matrix.
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| CN112115622A (en) * | 2020-09-27 | 2020-12-22 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Radiation dose field distribution evaluation method and system fusing measured data |
| CN112115622B (en) * | 2020-09-27 | 2024-03-26 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Radiation dose field distribution evaluation method and system integrating measured data |
| CN115910418A (en) * | 2021-08-05 | 2023-04-04 | 合肥锐视医疗科技有限公司 | Preparation method of radiation protection box body based on Monte Carlo simulation |
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