CN103592670B - Gamma radioactive gas body source Absolute detection efficiency graduation apparatus and method - Google Patents
Gamma radioactive gas body source Absolute detection efficiency graduation apparatus and method Download PDFInfo
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Abstract
Gamma radioactive gas body source Absolute detection efficiency graduation apparatus of the present invention and method, comprise standard plane source, solid little source, solid big source, gas big source, gas body source and detector; When internal cavity height H in gas big source is less than certain particular value Y, the gamma ray Absolute detection efficiency deviation in solid big source and gas big source is less than 0.5%, can think that both detection efficiencys are equivalent within 0.5%. Get Y value and prepare gas big source, obtain the equivalent detection efficiency in gas big source by the solid easily measuring detection efficiency big source, the detection efficiency of gas body source can be obtained by the ratio in gas big source with the volume of gas body source. The methods such as the equivalence of the ingenious utilization mass transfer of the present invention, efficiency, volume transition achieve the Absolute detection efficiency scale that arbitrary shape is not out of shape gas body source. This device and the easy easily realization of method.
Description
Technical field
The present invention relates to the Absolute detection efficiency scale technology in gamma ray irradiation source in Application of Nuclear Technology field, it is specifically related to Absolute detection efficiency graduation apparatus and the method for gamma radioactive gas body source.
Background technology
In Application of Nuclear Technology field, gamma ray gas body source is one of main measuring object. HPGe gamma spectrometer is a kind of relative measurement system, gas body source is to emission gamma-rays, HPGe gamma spectrometer detection gamma-rays, the Characteristic �� ray total-energy peak of each radionuclide in gas body source can be obtained, want the activity of accurate mensurated gas composition body source, except nuclear parameter, in addition it is also necessary to the Absolute detection efficiency calibration value of the relevant gamma ray of HPGe gamma spectrometer detection. Demarcate relative to the Absolute detection efficiency of solid radiation and liquid, radioactive gas has and easily flows and take the big feature of volume, must source processed and measurement under very high air-proof condition, prepared source body source often, not easily it is prepared into point source or source, face, brings very big difficulty to the accurate demarcation of Absolute detection efficiency.
The Absolute detection efficiency scale method of gas body source generally has following several. Document (XIEFeng, HEXiaobing etc., Determinationofabsolutegamma-rayemissionprobabilitiesfor88Kr, NuclearScienceandTechniques, 2011) the liquid body source Absolute detection efficiency curve negotiating identical with gas body source size, material is adopted to correct the Absolute detection efficiency that self-absorption obtains gas body source in, simultaneously after daughter with ��-�� coincidence method absolute calibration's radioactive gas nuclide, by the Absolute detection efficiency of dead scale Extrapolation gas body source. But there is the shortcomings such as source processed is difficult, Gamma spectrum analysis difficulty during liquid body source Absolute detection efficiency calibration curve, if liquid body source exists bubble in filling process, or radioactive liquid is spread across source box outer surfac, all can affect the accuracy of demarcation. And, the method demarcated with radioactive gas nuclide daughter activity often needs the good film source of preparation quality, and it is very difficult for needing during preparation to wash down the daughter of decay completely simultaneously. These problems make above method be difficult to hold in use, should not form conventional scaling method. The Absolute detection efficiency curve that " mixing nucleic �� point source volume sample Absolute detection efficiency scale method " (number of patent application is 201113392127.9) is measured around detector by adopting the mixed nucleic �� point source of solid, calculate in conjunction with Monte Carlo simulation, it is determined that detector is to the Absolute detection efficiency of arbitrary axis symmetric shape volume sample. The method to point source and body source size, put source position and the accurate description of panel detector structure require very high, if body source structure and size describe inaccurate, dependency theory calculate result can bring relatively large deviation. Also adopt the softwares such as LabSOCS both at home and abroad or cover the passive scale that card analog calculation realizes gas source, save the process with standard gas source scale, it is to increase working efficiency, but the method exists bigger error. On the other hand, document (Tian Zining etc. pedotheque �� spectrum analysis Gamma spectrum analysis technical study, radio-protective, 2013) source, face scale technology is adopted, source, face is tested at distance crystal different heights h, determine variation relation �� (h) of source, face Absolute detection efficiency with height, integration obtains the Absolute detection efficiency of gas body source, the method complex steps, with source, face place change in location size whether evenly, selected location number etc. factor closely related, be not suitable for split hair caccuracy and measure.
Analyze from above, urgent need a kind of simplicity of development, fast, gamma radioactive gas body source Absolute detection efficiency calibration technique accurately.
Summary of the invention
Consider from accuracy, reliability and ease for operation etc. are many-sided, the present invention proposes the Absolute detection efficiency graduation apparatus of a kind of gamma radioactive gas body source and method, the methods such as the equivalence of ingenious utilization mass transfer, efficiency, volume transition achieve the Absolute detection efficiency scale that arbitrary shape is not out of shape gas body source. This device and the easy easily realization of method.
The principle of the invention:
Calculate from theoretical modeling, when internal cavity height H in gas big source is less than certain particular value Y, the gamma ray Absolute detection efficiency deviation in solid big source and gas big source is less than 0.5%, can think that both detection efficiencys are equivalent within 0.5%. Get Y value and prepare gas big source, obtain the equivalent detection efficiency in gas big source by the solid easily measuring detection efficiency big source, the detection efficiency of gas body source can be obtained by the ratio in gas big source with the volume of gas body source.
The technical scheme that a technical solution difficult problem of the present invention adopts is:
A kind of gamma radioactive gas body source Absolute detection efficiency graduation apparatus, its special character is:
Comprise standard plane source 1, solid little source 2, solid big source 3, gas big source 4, gas body source 5 and detector 6;
Described standard plane source 1 is cylinder shape with solid little source 2, has identical structure, size and material; Described standard plane source 1 has known activity, is placed in distance L place, detector 6 top for demarcating the Absolute detection efficiency of gamma ray, and wherein L is greater than 15cm;
Described solid big source 3 is cylinder shape, adopt gamma radioactive solution to prepare with solid little source 2 simultaneously, making gamma radioactive substance be uniformly distributed on little source carrier material 9 and solid big source carrier material 8 and sealed, the ratio of described solid big source 3 and the activity in solid little source 2 is the ratio of solution quality; The diameter D in described solid big source 31It is greater than the diameter d in solid little source 21;
The packaged material in source 4 big with gas, described solid big source 3 is identical, and inner and outer diameter is identical, and base plate thickness is h, and the internal cavity height in gas big source 4 is H;
Thin inlet mouth 7 is reserved in described gas big source 4; Described gas body source 5 reserves inlet mouth 10, and both are all equipped with valve 13; The internal diameter d of thin inlet mouth 7 is reserved in described gas big source 42It is less than 3mm.
A kind of gamma radioactive gas body source Absolute detection efficiency scale method, its special character is: the method includes the steps of:
1] the absolute efficiency curve of gamma ray is drawn:
It is positioned over range finder 6L place according to source, radioactive gas gamma ray energy choice criteria face 1 specifically to be measured, and coaxial with detector 6, demarcate the Absolute detection efficiency of multiple kinds of energy gamma ray, draw efficiency curve;
2] gas big source is prepared:
Outside diameter and the interior diameter of getting solid big source 3 and gas big source 4 are respectively D1And D2, the cavity heights getting gas big source 4 is H;
Wherein H value by the following method:
Big for a solid source 3 being positioned over range finder 6L place measure, big for a gas source 4 is positioned over range finder 6 (L-H/2) place and measures, both are all coaxial with detector 6; The efficiency variation in now solid big source 3 and gas big source 4 is calculated by theoretical modeling; When internal cavity height H in gas big source is less than certain particular value Y, the gamma ray Absolute detection efficiency deviation in solid big source and gas big source is less than 0.5%, it will be recognized that the gamma ray Absolute detection efficiency equivalence in solid big source and gas big source during internal cavity height H=Y; Or both the Absolute detection efficiency deviation amounts according to Theoretical Calculation, to obtain the Absolute detection efficiency in gas big source 4 after the Absolute detection efficiency in solid big source 3 correction deviation amount;
Volume requirement according to gas big source 4 is got H value and is prepared gas big source, it is desired to H is less than or equals Y;
3] solid little source and solid big source is prepared:
Selecting the radioactive nuleus cellulose solution containing appropriate energy gamma ray, weigh m1Load in solid little source 2 of little the source carrier material 9 of place mat in advance, sealing after solution steaming is dry; Weigh m2Load in solid big source 3 of big the source carrier material 8 of place mat in advance, sealing after solution steaming is dry;
4] activity in solid little source and solid big source is calculated
Little for the solid of a preparation source 2 is positioned over range finder 6L place, and coaxial with detector 6, measures the gamma ray peak of correlation energy, and integrating step 1] in the Absolute detection efficiency curve demarcated calculate the activity in solid little source 2, in conjunction with the m that weighs1And m2Calculate the activity in solid big source 3;
5] the equivalent Absolute detection efficiency in gas big source is calculated:
Big for the solid of a preparation source 3 is positioned over range finder 6L place, and it is coaxial with detector 6, measure the gamma ray peak of correlation energy, and integrating step 4] in the Activity Calculation in solid big source 3 obtain the Absolute detection efficiency in solid big source 3, according to step 2] analog calculation result obtains the Absolute detection efficiency in gas big source 4 after being equivalent to the Absolute detection efficiency in gas big source 4 or correction;
6] ratio of measurement gas big source 4 and the cavity volume of gas body source 5;
7] activity of gas big source and gas body source is calculated:
After big for a gas source 4 is connected with gas body source 5, after adopting vacuum pump system 12 to vacuumize, gamma radioactive gas 11 is adopted to balance inflation, after closing seal valve 13, big for a gas source 4 is positioned over range finder 6 (L-H/2) place, and coaxial with detector 6, measure the gamma ray peak of correlation energy; Integrating step 5] in the Absolute detection efficiency in gas big source 4 that obtains, calculate the activity in gas big source 4; Integrating step 6] in the ratio of volume calculate the activity of gas body source 5;
8] Absolute detection efficiency of gas body source at specific position is calculated:
Gas body source 5 is positioned over the gamma ray peak that correlation energy is measured in the position that range finder 6 is applicable to measuring arbitrarily, integrating step 7] in Absolute detection efficiency in this position of the Activity Calculation gas body source 5 of gas body source 5.
It is an advantage of the invention that:
1, radioactive source regular shape involved in the present invention, it is easy to make.
2, standard source transition involved by the calibration process of the present invention, mass transfer, volume transition and theoretical modeling calculate the Four processes such as equivalence and are routine operation, and simple and easy to do, uncertainty is little.
3, the present invention is ingenious utilizes the precise volumes ratio of gas big source with the equivalence in solid big source, the volume in gas big source and gas body source, successfully avoid complicated measuring process and self-absorption Theoretical Correction etc.
4, the gas body source of the arbitrary shape that deformation can be ignored can be carried out Absolute detection efficiency demarcation by the present invention, it is possible to carry out efficiency demarcation for different detector.
5, the thin inlet mouth on gas big source can significantly reduce conduit volume, to reduce this portion gas to the impact in source, overall gas face.
Accompanying drawing explanation
Fig. 1 is standard plane source measurement schematic diagram on the detector;
Fig. 2 is solid little source schematic diagram;
Fig. 3 is solid big source schematic diagram;
Fig. 4 is gas big source schematic diagram;
Fig. 5 is gas body source schematic diagram;
Fig. 6 is gas big source and gas body source balance inflation schematic diagram;
Fig. 7 is that schematic diagram is measured in solid big source
Fig. 8 is that schematic diagram is measured in gas big source;
Wherein: 1-standard plane source; 2-solid little source; 3-solid big source; 4-gas big source; 5-gas body source; 6-detector; The thin inlet mouth of 7-; 8-big source carrier material; 9-little source carrier material; 10-inlet mouth; 11-gamma radioactive gas; 12-vacuum pump system; 13-seal valve.
Embodiment
Standard plane source 1 and solid little source 2 are cylinder shape, have identical structure, size and material. Gamma radioactive substance is uniformly distributed on little source carrier material 9 and is sealed. Standard plane source radiation activity is known, can be placed in the Absolute detection efficiency that gamma ray is demarcated at distance L place, detector top, and L is greater than 15cm.
The packaged material in source big with gas, solid big source is identical, and inner and outer diameter is identical, and base plate thickness is h, and the internal cavity height in gas big source is H. Calculate the efficiency variation in solid big source and gas big source under following measuring condition by theoretical modeling: big for a solid source is positioned over range finder L and measures, big for a gas source is positioned over range finder (L-H/2) place and measures. Obtaining by analog calculation result, as H=Y, deviation is only 0.5%, now can think that the gamma ray Absolute detection efficiency in solid big source and gas big source is equivalent. According to both Absolute detection efficiency deviation amounts of Theoretical Calculation, the Absolute detection efficiency in gas big source after correcting deviation amount with the Absolute detection efficiency in solid big source, can also be obtained. Volume requirement according to gas big source gets cavity heights H value, and H is less than or equals certain particular value Y.
Adopting same gamma radioactive solution to prepare solid little source and solid big source, make gamma radioactive substance be uniformly distributed on little source carrier material and big face source carrier material and sealed, the ratio of both activity is gamma radioactive solution mass ratio. D1It is greater than d1��
Solid little source structure is identical with standard plane source. Little for a solid source is positioned over range finder L place, and coaxial with detector, measure the gamma ray of correlation energy.
Big for a solid source is positioned over range finder L place, and coaxial with detector, measure the gamma ray of correlation energy.
The container that gas big source 4 and gas body source 5 are under vacuum condition deformation can be ignored, thin inlet mouth 7 is reserved in gas big source 4, and gas body source 5 reserves inlet mouth 10, and both are all equipped with valve 13, and the ratio of both cavity volume is accurately measured. The internal diameter d of thin inlet mouth 7 is reserved in gas big source 42It is less than 3mm, to reduce this portion gas to the impact in source, overall gas face. The inlet mouth of gas big source and gas body source connects seal valve respectively. Vacuumize after big for a gas source and gas body tied to source, after adopting the balance inflation of gamma radioactive gas, close seal valve. Big for a gas source is unloaded and is positioned over range finder (L-H/2) place, and coaxial with detector, measure the gamma ray of correlation energy.
Gas body source is positioned over the gamma ray of the position measurement correlation energy that range finder is applicable to measuring arbitrarily.
A kind of gamma radioactive gas body source Absolute detection efficiency scale method, comprises following step:
1] standard plane source 1 is positioned over range finder 6L place, and coaxial with detector 6, demarcate the Absolute detection efficiency of multiple kinds of energy gamma ray, draw efficiency curve.
2] outside diameter and the interior diameter of getting solid big source 3 and gas big source 4 are respectively D1And D2, the cavity heights getting gas big source 4 is H. The efficiency variation in solid big source 3 and gas big source 4 under following measuring condition is calculated: big for a solid source 3 is positioned over range finder 6L and measures by theoretical modeling, big for a gas source 4 being positioned over range finder 6 (L-H/2) place measure, both are all coaxial with detector 6. Obtaining by analog calculation result, as H=Y, deviation reaches 0.5%, when ignoring this deviation, now can think that the gamma ray Absolute detection efficiency in solid big source 3 and gas big source 4 is equivalent. According to both Absolute detection efficiency deviation amounts of Theoretical Calculation, the Absolute detection efficiency in gas big source 4 after correcting deviation amount with the Absolute detection efficiency in solid big source 3, can also be obtained. Volume requirement according to gas big source 4 gets H value, and H is less than or equals Y.
3] selecting the radioactive nuleus cellulose solution containing suitable gamma ray, weigh m1Load in solid little source 2 of little the source carrier material 9 of place mat in advance, sealing after solution steaming is dry; Weigh m2Load in solid big source 3 of big the source carrier material 8 of place mat in advance, sealing after solution steaming is dry.
4] little for the solid of a preparation source 2 is positioned over range finder 6L place, and coaxial with detector 6, measures the gamma ray peak of correlation energy, and integrating step 1] in the Absolute detection efficiency curve demarcated calculate the activity in solid little source 2, in conjunction with the m that weighs1And m2, the activity in solid big source 3 is calculated by gamma radioactive solution mass ratio.
5] big for the solid of a preparation source 3 is positioned over range finder 6L place, and it is coaxial with detector 6, measure the gamma ray peak of correlation energy, and integrating step 4] in the Activity Calculation in solid big source 3 obtain the Absolute detection efficiency in solid big source 3, according to step 2] analog calculation result, adopt the Absolute detection efficiency in gas big the source 4 after equivalence or correction, calculate the activity of gas in gas big source 4.
6] such as Fig. 6, vacuumize after big for a gas source and gas body tied to source, after adopting the balance inflation of gamma radioactive gas, close seal valve, with confining gas big source and gas body source, and the ratio of measurement gas big source 4 and the cavity volume of gas body source 5.
7] after big for a gas source 4 being connected with gas body source 5, after adopting vacuum pump system 12 to vacuumize, gamma radioactive gas 11 is adopted to balance inflation, after closing seal valve 13, big for a gas source 4 is unloaded, it is positioned over range finder 6 (L-H/2) place, and coaxial with detector 6, measure the gamma ray peak of correlation energy; Integrating step 5] in the Absolute detection efficiency in gas big source 4 that obtains, calculate the activity in gas big source 4; Integrating step 6] in the ratio of volume calculate the activity of gas body source 5.
8] gas body source 5 is unloaded be positioned over the gamma ray peak that correlation energy is measured in the position that range finder 6 is applicable to measuring arbitrarily, integrating step 7] in Absolute detection efficiency in this position of the Activity Calculation gas body source 5 of gas body source 5.
The Absolute detection efficiency of gas body source 5 is obtained by the efficiency transition in above each source, activity transition and efficiency equivalence.
Embodiment:
When analyzing the gamma radioactive gas Kr-87 that neutron irradiation Kr-86 produces, it is desired to quantitatively providing the activity of the rear gaseous product Kr-87 of activation, sampling receptacle is the body source of 50ml. Therefore the Absolute detection efficiency of the Characteristic �� ray peak 402keV of the Kr-87 body source to 50ml is first needed to carry out scale. The scale method that employing the inventive method carries out gamma radioactive gas body source Absolute detection efficiency is as follows.
1) each radiation source container is prepared according to Fig. 1 to Fig. 5, wherein d1=28mm, d2=1mm, D1=75mm, D2=65mm, h=3mm, detector effective diameter is 60mm, L=250mm. By external diameter �� 28mm's152Eu standard plane source is positioned over range finder L place, and coaxial with detector, according to the clean counting rate in each ray peak (cps) that measurement obtains, demarcates the Absolute detection efficiency of 121��1408keV many gamma rays, Fitting efficiency curve.
2) MCNP (Monte Carlo simulation program) analog calculation condition: setting input population is 106, get gas big source internal cavity height H=4mm, big for a solid source be placed in 250mm above detector and coaxially locate to measure, big for a gas source (4) is positioned over (L-H/2)=248mm above detector and coaxially locates to measure. The gamma ray Absolute detection efficiency deviation of simulation result display solid big source (3) and gas big source (4) is less than 0.2%, it is possible to think that both are equivalent.
3) select152Eu solution, accurately weigh m1Load in solid little source of place mat filter paper carrier in advance, sealing after solution steaming is dry; Accurately weigh m2Load in solid big source of place mat filter paper carrier in advance, sealing after solution steaming is dry.
4) little for the solid of a preparation source being positioned over range finder L place, and coaxial with detector, measures each bar gamma ray total-energy peak, and in conjunction with the 2nd) Absolute detection efficiency demarcated in step calculates the activity in solid little source; In conjunction with the m that weighs1And m2Calculate the activity in solid big source,
5) big for the solid of a preparation source being positioned over range finder L=25cm place, and coaxial with detector, measures each bar gamma ray total-energy peak, and in conjunction with the 4th) Activity Calculation in step obtains the gamma ray Absolute detection efficiency curve in solid big source. This efficiency curve can be equivalent to the Absolute detection efficiency curve in gas big source.
6) ratio of accurately measurement gas big source and the cavity volume of gas body source. Use the benefit in gas big source to be, ensure gas big source and solid big source equivalence in H value while, the cavity volume in gas big source can be made as far as possible to become big, thus measure the ratio of its volume with gas body source more accurately, thus reduce uncertainty.
7) it is less than 5Pa by being evacuated to after big for a gas source and gas body tied to source, after closing evacuation passageway, adopt gamma radioactive gas Kr-87 to gas big source and the balance inflation of gas body source, close seal valve afterwards, big for a gas source is unloaded and is positioned over range finder 248mm place, and coaxial with detector, measure 402keVgamma ray peak; In conjunction with the 5th) the equivalent Absolute detection efficiency curve in gas big source in step, calculate the activity in gas big source; In conjunction with the 6th) ratio of volume in step calculates the activity of gas body source.
8) coaxial position that gas body source is positioned over range finder 250mm measures the gamma ray peak of 402keV, in conjunction with the 7th) Activity Calculation of gas body source obtains the 402keVgamma ray Absolute detection efficiency of Kr-87 gas body source in this position in step.
Claims (2)
1. a gamma radioactive gas body source Absolute detection efficiency graduation apparatus, it is characterised in that:
Comprise standard plane source (1), solid little source (2), solid big source (3), gas big source (4), gas body source (5) and detector (6);
Described standard plane source (1) and solid little source (2) are cylinder shape, have identical structure, size and material; Described standard plane source (1) has known activity, is placed in distance L place, detector (6) top for demarcating the Absolute detection efficiency of gamma ray, and wherein L is greater than 15cm;
Described solid big source (3) is cylinder shape, adopt gamma radioactive solution to prepare with solid little source (2) simultaneously, making gamma radioactive substance be uniformly distributed in little source carrier material (9) and solid big source carrier material (8) upper and sealed, the ratio of described solid big source (3) and the activity of solid little source (2) is the ratio of solution quality; The diameter D of described solid big source (3)1It is greater than the diameter d of solid little source (2)1;
The packaged material of described solid big source (3) source big with gas (4) is identical, and inner and outer diameter is identical, and base plate thickness is h, and the internal cavity height of gas big source (4) is H; H is value by the following method:
Big for a solid source (3) being positioned over range finder (6) L place measure, big for a gas source (4) is positioned over range finder (6) L-H/2 place and measures, both are all coaxial with detector (6); The efficiency variation of now solid big source (3) and gas big source (4) is calculated by theoretical modeling; When internal cavity height H in gas big source is less than certain particular value Y, the gamma ray Absolute detection efficiency deviation in solid big source and gas big source is less than 0.5%, it will be recognized that the gamma ray Absolute detection efficiency equivalence in solid big source and gas big source during internal cavity height H=Y; Or both the Absolute detection efficiency deviation amounts according to Theoretical Calculation, to obtain the Absolute detection efficiency of gas big source (4) after the Absolute detection efficiency of solid big source (3) correction deviation amount;
Volume requirement according to gas big source (4) is got H value and is prepared gas big source, it is desired to H is less than or equals Y;
Described gas big source (4) reserves thin inlet mouth (7); Described gas body source (5) reserves inlet mouth (10), and both are all equipped with valve (13); The internal diameter d of the reserved thin inlet mouth (7) of described gas big source (4)2It is less than 3mm.
2. a gamma radioactive gas body source Absolute detection efficiency scale method, it is characterised in that: the method includes the steps of:
1] the absolute efficiency curve of gamma ray is drawn:
It is positioned over range finder (6) L place according to source, radioactive gas gamma ray energy choice criteria face (1) specifically to be measured, and it is coaxial with detector (6), demarcate the Absolute detection efficiency of multiple kinds of energy gamma ray, draw efficiency curve;
2] gas big source is prepared:
Outside diameter and the interior diameter of getting solid big source (3) and gas big source (4) are respectively D1And D2, the cavity heights getting gas big source (4) is H;
Wherein H value by the following method:
Big for a solid source (3) being positioned over range finder (6) L place measure, big for a gas source (4) is positioned over range finder (6) L-H/2 place and measures, both are all coaxial with detector (6); The efficiency variation of now solid big source (3) and gas big source (4) is calculated by theoretical modeling; When internal cavity height H in gas big source is less than certain particular value Y, the gamma ray Absolute detection efficiency deviation in solid big source and gas big source is less than 0.5%, it will be recognized that the gamma ray Absolute detection efficiency equivalence in solid big source and gas big source during internal cavity height H=Y; Or both the Absolute detection efficiency deviation amounts according to Theoretical Calculation, to obtain the Absolute detection efficiency of gas big source (4) after the Absolute detection efficiency of solid big source (3) correction deviation amount;
Volume requirement according to gas big source (4) is got H value and is prepared gas big source, it is desired to H is less than or equals Y;
3] solid little source and solid big source is prepared:
Selecting the radioactive nuleus cellulose solution containing appropriate energy gamma ray, weigh m1Load in solid little source (2) of little the source carrier material (9) of place mat in advance, sealing after solution steaming is dry; Weigh m2Load in solid big source (3) of big the source carrier material (8) of place mat in advance, sealing after solution steaming is dry;
4] activity in solid little source and solid big source is calculated
Solid little source (2) of preparation is positioned over range finder (6) L place, and it is coaxial with detector (6), measure the gamma ray peak of correlation energy, and integrating step 1] in demarcate Absolute detection efficiency curve calculate solid little source (2) activity, in conjunction with the m that weighs1And m2Calculate the activity of solid big source (3);
5] the equivalent Absolute detection efficiency in gas big source is calculated:
Solid big source (3) of preparation is positioned over range finder (6) L place, and it is coaxial with detector (6), measure the gamma ray peak of correlation energy, and integrating step 4] in the Activity Calculation of solid big source (3) obtain the Absolute detection efficiency of solid big source (3), according to step 2] analog calculation result obtains the Absolute detection efficiency of gas big source (4) after being equivalent to the Absolute detection efficiency of gas big source (4) or correction;
6] ratio of the cavity volume of measurement gas big source (4) and gas body source (5);
7] activity of gas big source and gas body source is calculated:
After big for a gas source (4) is connected with gas body source (5), after adopting vacuum pump system (12) to vacuumize, adopt gamma radioactive gas (11) balance inflation, after closing seal valve (13), big for a gas source (4) is positioned over range finder (6) L-H/2 place, and coaxial with detector (6), measure the gamma ray peak of correlation energy; Integrating step 5] in the Absolute detection efficiency of gas big source (4) that obtains, calculate the activity of gas big source (4); Integrating step 6] in the ratio of volume calculate the activity of gas body source (5);
8] Absolute detection efficiency of gas body source at specific position is calculated:
Gas body source (5) is positioned over the gamma ray peak that correlation energy is measured in the position that range finder (6) arbitrarily is applicable to measuring, integrating step 7] in Absolute detection efficiency in this position of Activity Calculation gas body source (5) of gas body source (5).
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| CN109085639B (en) * | 2018-08-20 | 2020-08-21 | 中国原子能科学研究院 | A kind of133Preparation of Xe simulation gas source and detection efficiency correction method |
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| CN116594054B (en) * | 2023-07-18 | 2023-09-26 | 清华大学 | The method comprises the following steps of 233 Pa standard gamma source and preparation method and application thereof |
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| JP2013186014A (en) * | 2012-03-09 | 2013-09-19 | Hitachi Ltd | Calibration method of radiation detector and radiation monitoring device |
| CN103364818B (en) * | 2013-07-12 | 2016-06-15 | 西北核技术研究所 | Source, radioactivity face automatic imitation scale gas source detection efficient device and method |
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