CN103308534A - Chromatographic gamma scanning measurement method - Google Patents
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- CN103308534A CN103308534A CN2012100659433A CN201210065943A CN103308534A CN 103308534 A CN103308534 A CN 103308534A CN 2012100659433 A CN2012100659433 A CN 2012100659433A CN 201210065943 A CN201210065943 A CN 201210065943A CN 103308534 A CN103308534 A CN 103308534A
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- 238000000691 measurement method Methods 0.000 title abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 79
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000004587 chromatography analysis Methods 0.000 claims abstract description 24
- 238000013519 translation Methods 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 27
- 238000013517 stratification Methods 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 abstract description 12
- 239000000523 sample Substances 0.000 description 63
- 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
- 238000002474 experimental method Methods 0.000 description 6
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical group [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000002285 radioactive effect Effects 0.000 description 5
- 238000004364 calculation method 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
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 229910052778 Plutonium Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 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
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding 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
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing 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
- 229910002007 uranyl nitrate Inorganic materials 0.000 description 1
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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 the radiation detection technology field, particularly a kind of chromatography gamma scanning survey method for non-homogeneous radioactivity material.
Background technology
Before radioactive waste and Waste disposal and processing, need to contamination wherein quantitatively be detected, detection for radioactive waste heterogeneous and refuse, owing to can't obtain representative sample and carrying out quantitative measurment and analysis with chemical analysis method, therefore, effective method is Dynamic Non-Destruction Measurement, the measuring equipment that uses is chromatography gamma scanning and measuring apparatus, this Measurement and analysis technology is at first with the sample axial stratification, by moving horizontally and rotating sample is divided into several small cubes (voxel) in every one deck, each voxel is measured and analyzed, obtain the content of radioactive nuclide in each voxel, the radioactive content addition of each voxel is obtained radioactive content of this sample.
At present, both at home and abroad for the sample bucket of diameter less than 400 millimeters, general 6 * 6 measurement patterns that adopt, be about to every one deck sample and evenly be divided in the horizontal direction 6 measuring positions, 9 angles of each measuring position rotation (each angle is 20 degree), carry out 54 times and measure, obtain 54 measurement data.With these 54 measurement data find the solution 36 in the voxel Media density and the contamination of nucleic.More about the disclosed pertinent literature of chromatography gamma scanning survey method, but from existing disclosed document, all be that the ultimate principle of method has been carried out concise and to the point description basically in the document, do not carry out any report for wherein concrete operation steps or method, and the time of at every turn measuring in the existing measuring method is identical, and the Measuring Time of Measurement and analysis method is long, and analytical precision is low, maloperation is difficult for being found, and often causes realizing unsuccessfully.
Summary of the invention
The present invention has overcome deficiency of the prior art, and the chromatography gamma scanning survey that a kind of Measuring Time is short, analysis precision is high, accuracy of measurement is high method is provided.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of chromatography gamma scanning survey method, it may further comprise the steps:
(1) sample is carried out transmission measurement, it comprises that (1) positions sample, axial stratification, (2) every one deck is chosen equally spaced translation location point, (3) at each horizontal translation location point, sample is around the rotation of platform central shaft, and equal angles is chosen 8 anglecs of rotation in 0 °～180 °, every rotation one-shot measurement once, each horizontal level point measurement 8 times; (2) sample is carried out emission measurement; (3) the dielectric wire attenuation coefficient that utilizes transmission gamma scanning survey to obtain is proofreaied and correct the attenuation by absorption that the emission gamma rays passes the sample medium, thereby obtains contamination.
The present invention is all right:
In the described step (two) sample is carried out emission measurement, comprise that (1) 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 is around the rotation of platform central shaft, equal angles is chosen 8 anglecs of rotation in 0 °～180 °, every rotation one-shot measurement once, each horizontal level point measurement 8 times.
In the measurement of described step (1) and (2), by peak area interested and two condition control data acquisition times of Measuring Time.
Described step (one) is chosen equally spaced 6 translation location points.
Described step (two) is chosen 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, reduced Measuring Time, utilize simultaneously the consistance of measuring position symmetric points measurement data that experiment is tested, judged timely the experiment correctness, guaranteed that surveying work normally moves.
(2) when carrying out data acquisition, utilize two condition control data acquisition times of peak area interested and Measuring Time, reduced Measuring Time, simultaneously each measurement point data statistics has larger improvement, has greatly improved the accuracy of measurement result.
(3) when measurement data is analyzed, reject the poor data of part statistical, improved the accuracy of data analysis, shortened analysis time.
Description of drawings
Fig. 1 chromatography gamma scanister structure schematic top plan view
Fig. 2 sample instrumentation plan
1 front collimating apparatus, 2 transmission source, 3 shields, 4 supports, 5 rear collimating apparatuss, 6 detectors
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 chromatography gamma scanning and measuring apparatus, this installs referred to as TGS, and it mainly is comprised of transmission source subassembly, detector system, Sample location scanning system, multi-channel analysis and data-acquisition system, Measurement and Control System.The transmission source subassembly is comprised of gamma transmission source 2 and front collimating apparatus 1, produces the beam of transmission scan.Detector system is comprised of HPGe (HpGe) detector 6, rear collimating apparatus 5 and shield 3, HPGe detector system record enters the gamma rays in the HPGe probe, and its gamma ionising radiation is converted into electric signal, prime amplifier and main amplifier through nuclear electronics amplify, and obtain data by the data acquisition system (DAS) of back.The Sample location scanning system is comprised of 3 stepper motors and support 4, is to make the TGS device realize the three-dimensional high-precision scanning motion.Mode of motion is translation (location survey position), rotation (being divided into all angles) and lifting (axial stratification).Multi-channel analysis and data-acquisition system are that the record detector is surveyed the gamma rays power spectrum, process for data.Measurement and Control System is to provide the Automatic Control function for the TGS measurement, realization is coordinated sequential control and system's each several part of the logic control of the accurate control of mechanical motion in the scanning process, system, sequential control, scanning work flow process, and undertakes the security of system interlocked control.
The TGS scanning survey is divided into two parts: transmission scan is measured and emission scan is measured, the transmission scan measurement is to utilize a transmission source that adds 2, sample is carried out a three-dimensional scanning survey, analyze the transmission scan data, the line attenuation coefficient that obtains each voxel in the sample distributes, emission measurement is that the gamma rays that nucleic in the sample emits itself is measured, and obtains the content of nucleic radioactivity in the sample by the analysis to transmitting data and line attenuation coefficient.
During scanning survey, by the Sample location system, upper and lower lifting sample with the sample axial stratification, to every one deck of sample, is chosen 6 equally spaced translation location points, and at each horizontal translation location point, sample centers on the platform central shaft to turn clockwise.Equal angles is chosen 8 anglecs of rotation in 0 °～180 °, every rotation one-shot measurement once, each horizontal level point measurement 8 times has 6 horizontal level points in one deck, altogether scanning survey 48 (6 * 8) is inferior, records 48 gamma-ray spectrometry data.In each the measurement, the data acquisition time is controlled peak area interested and Measuring Time by two conditions, these two conditions adopt the relation of "or", and namely no matter which condition is set up, this time measured and finished, store the gamma-ray spectrometry data, enter the measurement of next position or angle.
At first with the sample axial location in ground floor, then be moved horizontally to first measuring position, open transmission source 2, measure according to the measuring condition detector that arranges, after this measurement of angle finishes, the invariant position of example platform vertical direction and horizontal direction, the angle of one 22.5 degree of example platform rotation, again measure, after this measurement of angle finished, example platform rotated an angle (22.5 degree) again, after the circulation like this 8 times, platform Rotate 180 degree is got back to 0 degree position, angle, and platform is moved horizontally to second measuring position simultaneously, carries out the measurement of 8 angles, so circulation is 6 times, this layer sample measurement finishes, and carried out altogether 48 times and measured, and obtained 48 gamma-ray spectrometry data.Then sample moves to lower one deck, carries out equally 6 positions, and the measurement of each 8 angle in position so loops the N layer and measures, and the transmission measurement of such sample finishes.After transmission scan is measured and is finished, and then carry out emission scan and measure, 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 finishes.After Sample Scan is measured and is finished, utilize chromatography gamma scanning system software to carry out data analysis, the first step is to the transmission measurement data analysis, calculate net peak area, counting rate, the linear attenuation coefficient at gamma energy peak, then measuring the line attenuation coefficient that obtains with transmission scan comes the emission measurement data are processed, ray is passed the attenuation by absorption of sample and proofread and correct, thereby accurately obtain contamination in the sample.
Chromatography gamma scanning and measuring apparatus is mainly used in measurement and the analysis of non-homogeneous sample.Because the heterogeneity of sample, if identical Measuring Time is adopted in each position, the counting rate of some position is very high so, and the counting rate of some position is very low, the relatively poor measurement data of statistical is processed like this, the errors of analytical results that obtains is larger, solution to this problem is when data acquisition, control the time of data acquisition with peak area interested and two parameters of Measuring Time, namely when peak area interested reaches the numerical value of setting, no matter whether the Measuring Time that arranges has arrived, this measures end, but when peak area interested does not reach the numerical value of setting, and the Measuring Time that arranges has reached, this is measured also and finishes, and the result who does like this is improved the statistical of measurement data greatly, and then has improved the accuracy that whole sample is analyzed.
In the scanning survey, when sample is in 0 degree angle, as shown in Figure 2, gamma rays passes through small cubes No. 8, behind sample 90-degree rotation angle, gamma rays also passes through voxel No. 8, just voxel has rotated 90 degree in the horizontal direction, but be essentially identical for the data that measure, accordingly, can whether in the scope (relative deviation is 1%) of a permission, come the judgment means surveying work whether normal by the data (counting rate) that these two angles relatively obtain, if the scope that is allowing, measurement is proceeded, otherwise, stop to measure, location of mistakes reason, the rear scanning survey of correcting a mistake just can be proceeded, and has avoided like this mistake owing to one or several measurement data in the measuring process, and the situation of whole surveying work failure is occurred.
In the chromatography gamma technical data analysis, measuring system statistical error and sample voxel endobasal-body and radioactivity are non-homogeneous to be the resultant error main source, in the sample measurement of uranium-bearing plutonium material is analyzed, adopted the radioactivity of the chromatography 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, guaranteeing that system of equations has under the prerequisite of solution, can reject the poor measurement data of part statistical (2-3), so not only guarantee the accuracy of data analysis but also shortened analysis time.
Transmission computing method and emission computing method are as follows in the chromatography gamma scanning system software:
1. transmission measurement equation:
Make Pi equal the transmissivity that detector records i scanning survey position
Then:
P
i＝C
i/C
max 1
Wherein: C
iDetector recorded the γ photon count rate of transmission source 2 when expression had sample to exist i scanning survey position.
The gamma photons counting rate that detector recorded when Cmax represented that the gamma rays of transmission source 2 is not decayed by absorption of sample.
(1) formula is carried out number conversion, and obtains according to the attenuation law of ray through medium:
V
i＝-ln(P
i) 2
T in the following formula
IkBe the matrix element of M * N dimension matrix T, matrix T is referred to as dielectric wire decay thickness matrix.T
IkThe expression detector is i transmission measurement position, and the gamma rays of the transmission source 2 that is measured is through the line attenuation thickness of k voxel, μ
kIt is the line attenuation coefficient of k voxel.Separate above-mentioned transmission measurement equation (3), can solve μ
kValue.The problem that Here it is transmission measurement and data analysis will solve, these line attenuation coefficients μ
kValue will when analyzing the emission measurement data, do absorption correction and use.
2. emission measurement equation:
In emission measurement, when sample did not have attenuation by absorption, the emission measurement of each voxel can be described with following linear equation in the sample:
D＝E·S 4
Perhaps
Wherein: D
iRepresent i measuring position, measure the counting rate of the gamma rays of all voxel emissions in the sample, obtained by experiment measuring;
E
IjThat j voxel radioactive source is to the detection efficiency of detector i scanning survey position;
S
jThe source strength that represents j voxel radioactive source.
S
jValue try to achieve by solve an equation (4), the total radioactivity of whole sample is obtained by each voxel radioactivity summation, Here it is emission measurement with analyze the result that need to obtain, also be the final purpose of chromatography gamma scanning survey and analysis.
When there was attenuation by absorption in sample, equation (4) must be revised.Because the gamma rays of each voxel emission passes medium and will be absorbed decay, measurement result must be proofreaied and correct the attenuation by absorption loss of gamma rays.Can describe with linear equation (6) through the emission gamma-spectrometry problem after the attenuation by absorption correction.
F
ij＝E
ij·A
ij 7
A
ij＝∏
kexp(-T
ijk·μ
k) 8
Wherein:
F
IjEfficiency matrix unit behind the expression process self-absorption correction for attenuation is called correction for attenuation efficiency matrix unit.
A
IjRepresent detector i scanning survey position, the factor that the gamma rays of j voxel emission is decayed by Absorption of Medium.
T
IjkThe expression detector is i scanning survey position, measure gamma rays that j voxel launch before the arrival detector on the path of process by the line attenuation thickness of k voxel attenuation by absorption.
μ
kThe line attenuation coefficient that represents k voxel.
Embodiment 1
Contain the uranium sample experiment measuring and carry out at as shown in Figure 1 TGS device, measuring sample bucket be 30 centimetres of height, 30 centimetres of internal diameters, the stainless steel cask that wall thickness is 0.5 centimetre, one bottle of known quality of placement in the bucket
235U uranyl nitrtate high-enriched uranium solution (it is 9.6 centimetres that solution is sealed in diameter, highly is 14 centimetres, in the polyethylene can that wall thickness is 0.3 centimetre).Iron block, aluminium block, unit of plastic, iron filings and rag are placed arbitrarily as medium in other space in bucket.The transmission source 2 that transmission measurement uses is
75Se.
During scanning survey, adopt 6 * 6 * 6 sample voxel composition models, be about to sample bucket and axially be divided into 6 layers, every one deck is divided into 36 (6 * 6) piece, and every block element is the cube of 5 centimetres of the length of sides.At first by the Sample location system, with the 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.Equal angles is chosen 8 anglecs of rotation in the 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 a gamma-ray spectrometry that measures when existing without medium, 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 the gamma emission gamma-spectrometric datas of getting back like this, obtain 577 gamma-ray spectrometry data altogether.
Containing in the uranium sample of experiment measuring, the medium that existing density is very large (such as iron block), the less medium of density (such as rag) is also arranged, the non-constant of the homogeneity of sample medium and increased radioactivity, if the identical data acquisition time is adopted in each position in the process of measuring, the counting rate of some position is very high, and the counting rate of some position is very low, for example, (density of medium is less to pass through a few voxels at gamma rays, such as rag) arrive in the path of detector, the penetration capacity of ray is strong, and 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, such as iron block, aluminium block) arrives in the path of detector, a little less than the penetration capacity of ray, the counting rate of detector is very low, and under the both of these case, the counting rate that detector obtains differs more than ten times.The relatively poor measurement data of statistical is when carrying out data analysis with chromatography gamma scanning system software like this, the uranium content errors of analytical results is larger in the sample that obtains, solution to this problem is, in the control spectrometer data acquisition module of chromatography gamma system software, increase controlled condition, it or not the time of controlling separately data acquisition with peak area interested or the single condition of Measuring Time, but control time of the data acquisition of each measurement point with peak area interested or two parameters of Measuring Time, and these two parameters adopt the relation of logical "or", the method that realizes is, peak area interested and two parameters of Measuring Time are set as measuring the condition that whether finishes in the program code of chromatography gamma scanning system software, and two conditions are uninterruptedly carried out logical "or" to be judged, concrete grammar is, in measuring process, if the peak interested that spectrometer obtains (such as the 185.7keV energy peak of uranium) is when area reaches the numerical value (such as 2000) of setting, and this moment, Measuring Time did not also arrive 200 seconds that arrange, program has obtained peak area and has arrived the settings condition, computing machine sends and stops measuring command, spectrometer stops to obtain data, the storage gamma-spectrometric data, this point measurement finishes, simultaneous computer sends next measurement point order, and electric machine rotation drives example platform and moves to next measuring position.If the data acquisition time that arranges reaches, and peak area interested is not when reaching the numerical value (such as 2000) of setting, program has obtained Measuring Time and has arrived the settings condition, computing machine sends and stops measuring command, spectrometer stops to obtain data, the storage gamma-spectrometric data, and this point measurement finishes, simultaneous computer sends next measurement point order, and electric machine rotation drives example platform and moves to next measuring position.The result who does like this is improved the statistical of measurement data greatly, and then has improved the accuracy that whole sample is analyzed.
With the data analysis menu of chromatography gamma scanning system software 577 gamma-ray spectrometry data that gather are processed, treatment step is: at first carry out gamma-ray spectrometry and 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; Calculate the transmissivity of these 4 energy with the transmissivity equation; Adopt with attenuation coefficient of transmission matrix T (calculating in advance) and transmisivity data and to fall the attenuation coefficient function that calculates 136-400keV energy range endobasal-body for algorithm, with match and interpolation method obtain each voxel medium 185.7keV (
235The characteristic peak of U) line attenuation coefficient under the energy; The detection efficiency matrix (was calculated in advance, be stored in the array, device for a moulding, the physical dimension of detector and device has all been fixed, its detection efficiency matrix is definite value), the line attenuation coefficient of 185.7keV energy and emission measurement data (counting rate) take in the emission equation and carry out the attenuation by absorption correction calculation, obtain in the sample
235The U radioactivity.During this is measured, the experiment measuring value
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 are-2.1%.
Claims (5)
1. a chromatography gamma scanning survey method is characterized in that, it may further comprise the steps:
(1) sample is carried out transmission measurement, it comprises that (1) positions sample, axial stratification, (2) every one deck is chosen equally spaced translation location point, (3) at each horizontal translation location point, sample is around the rotation of platform central shaft, and equal angles is chosen 8 anglecs of rotation in 0 °～180 °, every rotation one-shot measurement once, each horizontal level point measurement 8 times;
(2) sample is carried out emission measurement;
(3) the dielectric wire attenuation coefficient that utilizes transmission gamma scanning survey to obtain is proofreaied and correct the attenuation by absorption that the emission gamma rays passes sample, thereby obtains contamination.
2. a kind of chromatography gamma scanning survey method according to claim 1, it is characterized in that, in the described step (two) sample is carried out emission measurement, comprise that (1) close transmission source, (2) sample is positioned, axial stratification, (3) every one deck is chosen equally spaced translation location point, (4) at each horizontal translation location point, sample is around the rotation of platform central shaft, equal angles is chosen 8 anglecs of rotation in 0 °～180 °, every rotation one-shot measurement once, each horizontal level point measurement 8 times.
3. a kind of chromatography gamma scanning survey method according to claim 1 is characterized in that, in the measurement of described step (1) and (2), by peak area interested and two condition control data acquisition times of Measuring Time.
4. a kind of chromatography gamma scanning survey method according to claim 1 is characterized in that, described step () is chosen equally spaced 6 translation location points.
5. a kind of chromatography gamma scanning survey method according to claim 1 is characterized in that, described step (two) is chosen equally spaced 6 translation location points.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901052A (en) * | 2014-03-19 | 2014-07-02 | 中国原子能科学研究院 | SGS (Segmented Gamma-ray Scanner) and TGS (Tomographic Gamma Scanning) combined measurement device and optimization method of collimator |
| CN104714245A (en) * | 2015-02-09 | 2015-06-17 | 上海交通大学 | Semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement |
| CN104865275A (en) * | 2015-05-21 | 2015-08-26 | 中国原子能科学研究院 | Correction method for SGS (segmented gamma scanning) technique transmission reconstruction distortion phenomenon |
| CN109541675A (en) * | 2018-12-06 | 2019-03-29 | 四川理工学院 | Tomographic Gamma scanning voxel efficiency calibration method based on point source space efficiency function |
| CN110554148A (en) * | 2019-09-23 | 2019-12-10 | 核工业理化工程研究院 | Sample scanning device for nondestructive measurement of materials |
| CN111580146A (en) * | 2020-05-28 | 2020-08-25 | 中国原子能科学研究院 | Radioactivity activity measuring device and measuring method |
| CN111722260A (en) * | 2020-06-24 | 2020-09-29 | 上海交通大学 | Transmission source storage and adjustment device |
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| 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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| CN103901052A (en) * | 2014-03-19 | 2014-07-02 | 中国原子能科学研究院 | SGS (Segmented Gamma-ray Scanner) and TGS (Tomographic Gamma Scanning) combined measurement device and optimization method of collimator |
| CN104714245A (en) * | 2015-02-09 | 2015-06-17 | 上海交通大学 | Semi-chromatography gamma scanning method for low-medium radioactive waste barrel measurement |
| 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 |
| CN104865275A (en) * | 2015-05-21 | 2015-08-26 | 中国原子能科学研究院 | Correction method for SGS (segmented gamma scanning) technique transmission reconstruction distortion phenomenon |
| 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 |
| CN109541675A (en) * | 2018-12-06 | 2019-03-29 | 四川理工学院 | Tomographic Gamma scanning voxel efficiency calibration method based on point source space efficiency function |
| 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 |
| CN110554148A (en) * | 2019-09-23 | 2019-12-10 | 核工业理化工程研究院 | Sample scanning device for nondestructive measurement of materials |
| CN111580146A (en) * | 2020-05-28 | 2020-08-25 | 中国原子能科学研究院 | Radioactivity activity measuring device and measuring method |
| CN111580146B (en) * | 2020-05-28 | 2022-06-28 | 中国原子能科学研究院 | Radioactivity measuring device and measuring method |
| CN111722260A (en) * | 2020-06-24 | 2020-09-29 | 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 |
| CN113284210A (en) * | 2021-06-07 | 2021-08-20 | 中国原子能科学研究院 | TGS transmission image reconstruction method, device, medium and electronic equipment |
| 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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