CN103308534B - Chromatographic gamma scanning measurement method - Google Patents
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- CN103308534B CN103308534B CN201210065943.3A CN201210065943A CN103308534B CN 103308534 B CN103308534 B CN 103308534B CN 201210065943 A CN201210065943 A CN 201210065943A CN 103308534 B CN103308534 B CN 103308534B
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- 238000000691 measurement method Methods 0.000 title abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 78
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000013519 translation Methods 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 29
- 238000013517 stratification Methods 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 abstract description 16
- 238000004587 chromatography analysis Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 62
- 238000001730 gamma-ray spectroscopy Methods 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000007405 data analysis Methods 0.000 description 8
- 229910052770 Uranium Inorganic materials 0.000 description 6
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical group [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000002285 radioactive effect Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002901 radioactive waste Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 it comprises Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052778 Plutonium Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000012497 inhomogeneous sample Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 125000005289 uranyl group Chemical group 0.000 description 1
- 229910002007 uranyl nitrate Inorganic materials 0.000 description 1
Abstract
The invention discloses a chromatographic gamma scanning measurement method, which comprises the following steps: the transmission measurement of the sample comprises (1) positioning the sample, axially layering, (2) selecting translation position points at equal intervals for each layer, (3) rotating the sample around the central axis of the platform at each horizontal translation position point, selecting 8 rotation angles at equal angles within 0-180 degrees, and measuring 8 times at each horizontal position point after each rotation; (II) carrying out emission measurement on the sample; and (III) correcting the absorption attenuation of the emitted gamma rays passing through the tested sample by using the attenuation coefficient of the medium line obtained by the transmission gamma scanning measurement, thereby obtaining the radioactivity content. The invention provides a chromatography gamma scanning measurement method with short measurement time, high analysis precision and high measurement accuracy.
Description
Technical field
The present invention relates to radiation detection technology field, particularly a kind of tomographic gamma scanning survey method for non-uniform radial material.
Background technology
Before radioactive waste and Waste disposal and process, need quantitatively to detect contamination wherein, for the detection of radioactive waste heterogeneous and refuse, quantitative measurment and analysis is carried out due to representative sample chemical analysis method cannot be obtained, therefore, effective method is Dynamic Non-Destruction Measurement, the measuring equipment used is tomographic gamma scanning and measuring apparatus, this Measurement and analysis technology is first by sample axial stratification, by moving horizontally and rotating, sample is divided into several small cubes (voxel) in every one deck, measuring and analysis is carried out to each voxel, obtain the content of radioactive nuclide in each voxel, radioactive for each voxel content is added the radioactive content obtaining this sample.
At present, diameter is less than to the sample bucket of 400 millimeters both at home and abroad, general employing 6 × 6 measurement pattern, 6 measuring positions are evenly divided in the horizontal direction by every one deck sample, each measuring position rotates 9 angles (each angle is 20 degree), carry out 54 times to measure, obtain 54 measurement data.The contamination of Media density in 36 voxels and nucleic is solved by these 54 measurement data.More about pertinent literature disclosed in tomographic gamma scanning survey method, but from existing disclosed document, all that concise and to the point description has been carried out to the ultimate principle of method substantially in document, any report is not carried out for concrete operation steps wherein or method, and the time of measuring in existing measuring method is identical at every turn, the Measuring Time of Measurement and analysis method is long, and analytical precision is low, maloperation is not easily found, and often causes realizing unsuccessfully.
Summary of the invention
Instant invention overcomes deficiency of the prior art, provide a kind of tomographic gamma scanning survey method that Measuring Time is short, analysis precision is high, accuracy of measurement is high.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of tomographic gamma scanning survey method, it comprises the following steps:
(1) transmission measurement is carried out to sample, it comprises, and sample positions by (1), axial stratification, (2) equally spaced translation location point is chosen to every one deck, (3) at each horizontal translation location point, sample rotates around Platform center axle, angularly chooses 8 anglecs of rotation in 0 ° ~ 180 °, often rotate one-shot measurement once, each horizontal level point measures 8 times; (2) emission measurement is carried out to sample; (3) the dielectric wire attenuation coefficient utilizing transmission gamma scanning survey to obtain corrects launching the attenuation by absorption of gamma rays through sample medium, thus obtains contamination.
The present invention is all right:
In described step (two), emission measurement is carried out to sample, comprise (1) and close transmission source, (2) sample is positioned, axial stratification, (3) choose equally spaced translation location point to every one deck, and (4) are at each horizontal translation location point, sample rotates around Platform center axle, in 0 ° ~ 180 °, angularly choose 8 anglecs of rotation, often rotate one-shot measurement once, each horizontal level point measures 8 times.
In described step (1) and the measurement of (2), by peak area interested and Measuring Time two condition control data acquisition times.
Described step (one) chooses equally spaced 6 translation location points.
Described step (two) chooses equally spaced 6 translation location points.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the method adopts 8 angles to measure in each measuring position of every one deck, reduce Measuring Time, utilize the consistance of measuring position symmetric points measurement data to test to experiment simultaneously, judged experiment correctness timely, ensure that surveying work normally runs.
(2) when carrying out data acquisition, utilizing peak area interested and Measuring Time two condition control data acquisition times, reducing Measuring Time, each measurement point data statistics simultaneously has larger improvement, substantially increases the accuracy of measurement result.
(3) when measurement data is analyzed, reject the data that part is statistically poor, improve the accuracy of data analysis, shorten analysis time.
Accompanying drawing explanation
Fig. 1 tomographic gamma scanister structure schematic top plan view
Fig. 2 sample instrumentation plan
Collimating apparatus, 2 transmission source, 3 shields, 4 supports, 5 rear collimating apparatus, 6 detectors before 1
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
As shown in Figure 1, a kind of tomographic gamma scanning and measuring apparatus, this device is referred to as TGS, and it forms primarily of transmission source subassembly, detector system, Sample location scanning system, multi-channel analysis and data-acquisition system, Measurement and Control System.Transmission source subassembly is made up of gamma transmission source 2 and front collimating apparatus 1, produces the beam of transmission scan.Detector system is made up of HPGe (HpGe) detector 6, rear collimating apparatus 5 and shield 3, HPGe detector system record enters the gamma rays in HPGe probe, and its gamma ionising radiation is converted into electric signal, through prime amplifier and the main amplifier amplification of nuclear electronics, obtain data by data acquisition system (DAS) below.Sample location scanning system is made up of 3 stepper motors and support 4, is to make TGS device realize three-dimensional high-precision scanning motion.Mode of motion is translation (location survey position), rotates (being divided into all angles) and lifting (axial stratification).Multi-channel analysis and data-acquisition system are record gamma-ray energy spectrum that detector is surveyed, for data processing.Measurement and Control System is for TGS measurement provides Automatic Control function, realize the logic control to the accurate control of mechanical motion in scanning process, system, sequential control, the sequential control of scanning work flow process and system components to coordinate, and the safety interlocking undertaking system controls.
TGS scanning survey is divided into two parts: transmission scan is measured and emission scan is measured, transmission scan measurement utilizes an additional transmission source 2, a three-dimensional scanning survey is carried out to sample, analyze transmission scan data, obtain the line attenuation coefficient distribution of each voxel in sample, emission measurement measures the gamma rays that nucleic in sample emits itself, by obtaining the content of nucleic radioactivity in sample to the analysis of transmitting data and line attenuation coefficient.
During scanning survey, by sample positioning system, upper and lower lifting sample, by sample axial stratification, to every one deck of sample, chooses 6 equally spaced translation location points, at each horizontal translation location point, sample around Platform center axle to turn clockwise.In 0 ° ~ 180 °, angularly choose 8 anglecs of rotation, often rotate one-shot measurement once, each horizontal level point measures 8 times, has 6 horizontal level points in one deck, and scanning survey 48 (6 × 8) is secondary altogether, records 48 gamma-ray spectrometry data.In each measurement, controlled according to acquisition time by two conditional log, peak area interested and Measuring Time, these two conditions adopt the relation of "or", and namely no matter which condition is set up, and this time is measured and terminated, store gamma-ray spectrometry data, enter the measurement of next position or angle.
First sample is axially positioned in ground floor, then first measuring position is moved horizontally to, open transmission source 2, measure according to the measuring condition detector arranged, after this measurement of angle terminates, the invariant position of example platform vertical direction and horizontal direction, example platform rotates the angle of 22.5 degree, again measure, after this measurement of angle terminates, example platform rotates an angle (22.5 degree) again, after circulation like this 8 times, platform revolves turnback gets back to 0 degree of Angle Position, plateau levels moves to second measuring position simultaneously, carry out the measurement of 8 angles, circulation like this 6 times, this layer of sample is measured and is terminated, carry out 48 times altogether to measure, obtain 48 gamma-ray spectrometry data.Then sample moves to lower one deck, carries out 6 positions equally, the measurement of 8 angles in each position, and so the measurement of N layer is carried out in circulation, and the transmission measurement of such sample terminates.After transmission scan measurement terminates, and then carry out emission scan measurement, the flow process that emission scan is measured and transmission scan are measured just the same, namely carry out 6 positions at every one deck, the scanning survey of 8 angles is carried out in each position, and difference is that transmission source 2 is in closed condition.The measurement of whole like this sample terminates.After Sample Scan measurement terminates, tomographic gamma scanning system software is utilized to carry out data analysis, the first step is to transmission measurement data analysis, calculate net peak area, counting rate, the linear attenuation coefficient at gamma energy peak, then measure with transmission scan the line attenuation coefficient obtained to process emission measurement data, the attenuation by absorption of ray through sample is corrected, thus accurately obtains contamination in sample.
Tomographic gamma scanning and measuring apparatus, is mainly used in the measuring and analysis of inhomogeneous sample.Due to the heterogeneity of sample, if each position adopts identical Measuring Time, so the counting rate of some position is very high, and the counting rate of some position is very low, so statistically poor measurement data processes, the errors of analytical results obtained is larger, solution to this problem is when data acquisition, the time of control data acquisition is carried out by peak area interested and Measuring Time two parameters, namely when peak area interested reaches the numerical value of setting, no matter whether the Measuring Time arranged has arrived, this measurement terminates, but when peak area interested does not reach the numerical value of setting, and the Measuring Time arranged has reached, this measurement also terminates, the result done like this makes statistically greatly being improved of measurement data, and then improve the accuracy of whole sample analysis.
In scanning survey, when sample is in 0 degree of angle, as shown in Figure 2, gamma rays passes through No. 8 small cubes, when behind sample 90-degree rotation angle, gamma rays also passes through No. 8 voxels, just voxel have rotated 90 degree in the horizontal direction, but be substantially identical for measuring the data obtained, accordingly, whether whether the data (counting rate) that can obtain by comparing these two angles carry out judgment means surveying work in a scope (relative deviation is 1%) allowed normal, if the scope allowed, measurement proceeds, otherwise, stop measuring, location of mistakes reason, after correcting a mistake, scanning survey just can proceed, this avoid the mistake due to one or several measurement data in measuring process, and the situation of whole surveying work failure is occurred.
In tomographic gamma technical data analysis, measuring system statistical error and sample voxel endobasal-body and radioactivity non-homogeneous be resultant error main source, in the sample Measurement and analysis to uranium-bearing plutonium material, have employed the radioactivity of the tomographic gamma scanning algorithm calculation sample of Problem with Some Constrained Conditions, because measurement data number (48) is greater than the number (36) of unknown number, under ensureing that system of equations has the prerequisite of solution, the statistically poor measurement data of part (2-3) can be rejected, so not only ensure the accuracy of data analysis but also shorten analysis time.
In tomographic gamma scanning system software, transmission computing method are as follows with transmitting computing method:
1. transmission measurement equation:
The transmissivity making Pi equal detector recording i-th scanning survey position
Then:
P
i＝C
i/C
max1
Wherein: C
iwhen indicating that sample exists, detector records the γ photon count rate of transmission source 2 i-th scanning survey position.
The gamma photons counting rate that when Cmax represents that the gamma rays of transmission source 2 is not decayed by absorption of sample, detector records.
(1) formula is carried out Logarithm conversion, and obtains according to the attenuation law of ray through medium:
V
i＝-ln(P
i)2
T in above formula
ikbe the matrix element that M × N ties up matrix T, matrix T is referred to as dielectric wire decay thickness matrix.T
ikrepresent that detector is i-th transmission measurement position, by the gamma rays of transmission source 2 that the measures line attenuation thickness through a kth voxel, μ
kit is the line attenuation coefficient of a kth voxel.Separate above-mentioned transmission measurement equation (3), can μ be solved
kvalue.Here it is transmission measurement and the problem that data analysis will solve, these line attenuation coefficients μ
kvalue will analyze emission measurement data time do absorption correction use.
2. emission measurement equation:
In emission measurement, when sample does not have attenuation by absorption, in sample, the emission measurement of each voxel can describe with linear equation below:
D＝E·S4
Or
Wherein: D
irepresent i-th measuring position, measure the counting rate of the gamma rays that all voxels are launched in sample, obtained by experiment measuring;
E
ijthat a jth voxel radioactive source is to the detection efficiency of detector i-th scanning survey position;
S
jrepresent the source strength of a jth voxel radioactive source.
S
jvalue tried to achieve by solve an equation (4), the total radioactivity of whole sample is sued for peace by each voxel radioactivity and is obtained, Here it is emission measurement with analyze the result needing to obtain, be also the final purpose of tomographic gamma scanning survey and analysis.
When sample exists attenuation by absorption, equation (4) must be revised.Because the gamma rays that each voxel is launched will by attenuation by absorption through medium, measurement result must correct the attenuation by absorption loss of gamma rays.Transmitting gamma-spectrometry problem after attenuation by absorption corrects can describe with linear equation (6).
F
ij＝E
ij·A
ij7
A
ij＝∏
kexp(-T
ijk·μ
k)8
Wherein:
F
ijrepresent the unit of the efficiency matrix after self-absorption correction for attenuation, be called correction for attenuation efficiency matrix unit.
A
ijrepresent that detector is i-th scanning survey position, the factor that the gamma rays that a jth voxel is launched is decayed by Absorption of Medium.
T
ijkrepresent that detector is i-th scanning survey position, the gamma rays measuring the transmitting of jth voxel before reaching the detector process path on by the line attenuation thickness of a kth voxel attenuation by absorption.
μ
krepresent the line attenuation coefficient of a kth voxel.
Embodiment 1
Uranium-bearing sample experiments is measured and is carried out on TGS device as shown in Figure 1, and measuring sample bucket is height 30 centimetres, internal diameter 30 centimetres, the stainless steel cask that wall thickness is 0.5 centimetre, the interior placement of bucket one bottle of known quality
235u uranyl nitrtate high-enriched uranium solution (it is 9.6 centimetres that solution is sealed in diameter, is highly 14 centimetres, in the polyethylene can that wall thickness is 0.3 centimetre).In bucket, iron block, aluminium block, unit of plastic, iron filings and rag are placed arbitrarily as medium in other space.The transmission source 2 that transmission measurement uses is
75se.
During scanning survey, adopt 6 × 6 × 6 sample voxel composition models, be axially divided into 6 layers by sample bucket, every one deck is divided into 36 (6 × 6) block, and every block element is the cube of the length of side 5 centimetres.First by sample positioning system, by sample axial stratification, at every one deck, choose 6 equally spaced translation location points, at each translation location point, sample rotates in a clockwise direction around the central shaft of rotation platform.8 anglecs of rotation are angularly chosen in 0-180 degree, each measurement of angle 1 time, obtain gamma-ray spectrometry data, every layer obtains 48 gamma-ray spectrometry data, 6 layers obtain 288 altogether, add the gamma-ray spectrometry that measurement when existing without medium obtains, transmission measurement obtains 289 gamma-ray spectrometry data altogether.Then close transmission source 2, carry out emission measurement according to above-mentioned identical mode, 288 gamma emission energy modal data of getting back, like this, altogether obtain 577 gamma-ray spectrometry data.
Experiment measuring containing in uranium sample, the medium (as iron block) that existing density is very large, also the medium (as rag) that density is less is had, the non-constant of homogeneity of sample medium and increased radioactivity, if each position adopts identical data obtaining time in the process measured, the counting rate of some position is very high, and the counting rate of some position is very low, such as, (density of medium is less to pass through a few voxels at gamma rays, as rag) arrive in the path of detector, the penetration capacity of ray is strong, the counting rate of detector is very high, on the contrary, in certain measuring position, gamma rays passes through a few voxels, and (density of medium is very large, as iron block, aluminium block) arrive in the path of detector, the penetration capacity of ray is weak, the counting rate of detector is very low, under both of these case, the counting rate that detector obtains differs more than ten times.So statistically poor measurement data is when carrying out data analysis with tomographic gamma scanning system software, in the sample obtained, uranium content errors of analytical results is larger, solution to this problem is, controlled condition is increased in the control spectrometer data acquisition module of tomographic gamma system software, it not the time of carrying out separately control data acquisition by peak area interested or the single condition of Measuring Time, but the time of the data acquisition of each measurement point is controlled by peak area interested or Measuring Time two parameters, and these two parameters adopt the relation of logical "or", the method realized is, peak area interested and Measuring Time two parameters are set in the program code of tomographic gamma scanning system software as measuring the condition whether terminated, and uninterruptedly logical "or" judgement is carried out to two conditions, concrete grammar is, in measuring process, if when the peak interested that spectrometer obtains (the 185.7keV energy peak as uranium) area reaches numerical value (as 2000) of setting, and now Measuring Time does not also arrive 200 seconds of setting, program obtains peak area and arrives settings condition, computing machine sends stopping measuring command, spectrometer stops obtaining data, stored energy modal data, this point is measured and is terminated, simultaneous computer sends next measurement point order, electric machine rotation drives example platform to move to next measuring position.If the data obtaining time arranged reaches, and peak area interested is not when reaching numerical value (as 2000) of setting, program obtains Measuring Time and arrives settings condition, computing machine sends stopping measuring command, spectrometer stops obtaining data, stored energy modal data, and this point is measured and terminated, simultaneous computer sends next measurement point order, and electric machine rotation drives example platform to move to next measuring position.The result done like this makes statistically greatly being improved of measurement data, and then improves the accuracy of whole sample analysis.
Process 577 the gamma-ray spectrometry data gathered with the data analysis menu of tomographic gamma scanning system software, treatment step is: first carry out gamma-ray spectrometry process, obtain sample to transmission source (
75se) net peak area of 4 energy (136.2,264.4,279.8 and 400.7keV), net peak area obtains counting rate except Measuring Time; The transmissivity of these 4 energy is calculated with transmissivity equation; Adopt by attenuation coefficient of transmission matrix T (calculated in advance) and transmisivity data and fall the attenuation coefficient function calculating 136-400keV energy range endobasal-body for algorithm, with matching and interpolation method obtain each voxel medium 185.7keV (
235the characteristic peak of U) line attenuation coefficient under energy; Detection efficiency matrix is (calculated in advance, be stored in array, for a shaping device, the physical dimension of detector and device all secures, its detection efficiency matrix is definite value), the line attenuation coefficient of 185.7keV energy and emission measurement data (counting rate) take to launch in equation and carry out attenuation by absorption correction calculation, obtain in sample
235u radioactivity.During this is measured, experimental measurements
235the activity of U is 1.85 × 10
5bq,
235the nominal value of the uranyl nitrate solution activity of U is 1.89 × 10
5bq, relative deviation is-2.1%.
Claims (5)
1. a tomographic gamma scanning survey method, is characterized in that, it comprises the following steps:
(1) transmission measurement is carried out to sample, it comprises, and sample positions by (1), axial stratification, (2) equally spaced translation location point is chosen to every one deck, (3) at each horizontal translation location point, sample rotates around Platform center axle, angularly chooses 8 anglecs of rotation in 0 ° ~ 180 °, often rotate one-shot measurement once, each horizontal level point measures 8 times;
(2) emission measurement is carried out to sample;
(3) the dielectric wire attenuation coefficient utilizing transmission gamma scanning survey to obtain corrects launching the attenuation by absorption of gamma rays through sample, thus obtains contamination.
2. a kind of tomographic gamma scanning survey method according to claim 1, it is characterized in that, in described step (two), emission measurement is carried out to sample, comprise (1) and close transmission source, (2) sample is positioned, axial stratification, (3) equally spaced translation location point is chosen to every one deck, (4) at each horizontal translation location point, sample rotates around Platform center axle, in 0 ° ~ 180 °, angularly choose 8 anglecs of rotation, often rotate one-shot measurement once, each horizontal level point measures 8 times.
3. a kind of tomographic gamma scanning survey method according to claim 1, is characterized in that, in described step () and the measurement of (two), by peak area interested and Measuring Time two condition control data acquisition times.
4. a kind of tomographic gamma scanning survey method according to claim 1, is characterized in that, described step () chooses equally spaced 6 translation location points.
5. a kind of tomographic gamma scanning survey method according to claim 1, is characterized in that, described step (two) chooses equally spaced 6 translation location points.
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| CN103901052B (en) * | 2014-03-19 | 2016-01-27 | 中国原子能科学研究院 | A kind of SGS and TGS combined measurement device and collimating apparatus optimization method |
| CN104714245B (en) * | 2015-02-09 | 2018-08-03 | 上海交通大学 | The half tomographic gamma scan method that middle cool waste bucket measures |
| CN104865275B (en) * | 2015-05-21 | 2018-01-19 | 中国原子能科学研究院 | The modification method provided for layering gamma scanning technique transmission reconstruction distortion phenomenon |
| CN109541675B (en) * | 2018-12-06 | 2020-05-26 | 四川理工学院 | Chromatography gamma scanning voxel efficiency calibration method based on point source space efficiency function |
| CN110554148B (en) * | 2019-09-23 | 2024-03-29 | 核工业理化工程研究院 | Sample scanning device for nondestructive measurement of materials |
| CN111580146B (en) * | 2020-05-28 | 2022-06-28 | 中国原子能科学研究院 | Radioactivity measuring device and measuring method |
| CN111722260B (en) * | 2020-06-24 | 2022-12-09 | 上海交通大学 | Transmission source storage and adjustment device |
| CN113049612A (en) * | 2021-03-15 | 2021-06-29 | 中国原子能科学研究院 | Segmented gamma measuring device and measuring method |
| CN113284210B (en) * | 2021-06-07 | 2024-03-22 | 中国原子能科学研究院 | TGS transmission image reconstruction method, device, medium and electronic equipment |
| CN113552610A (en) * | 2021-07-22 | 2021-10-26 | 中国核动力研究设计院 | Chromatography gamma scanning device and method based on array cadmium zinc telluride detector |
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Non-Patent Citations (1)
| Title |
|---|
| 层析γ扫描（TGS）重建技术的研究;张全虎;《中国博士学位论文全文数据库》;20031215(第4期);第23-24页第"2.1.1 TGS结构和扫描方法"节，第24页第"2.1.2 TGS测量方程"节，第26页第"2.2.1 探测效率刻度技术" * |
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