High Power Laser and Particle Beams, Volume. 34, Issue 2, 026005(2022)
Measurement of environmental level X, γ dose with conversion of complete spectra without deconvolution method of MC simulation
Figures & Tables(17)
Fig. 3. Diagram of calibration measuring situation for HPGe detector
Fig. 4. Comparison of experimental detection efficiency and simulated detection efficiency
Fig. 5. Experimental device for measuring radioactive source with high purity germanium detector
Fig. 6. Experimental device for measuring radioactive sources in a 10L spherical ionization chamber
Fig. 11. Energy spectrum of Co-60 of high purity germanium detector
Fig. 12. Energy spectrum of Cs-137 of high purity germanium detector
Table 1. Result of the calibration measurement of HPGe detector
View tableView in ArticleTable 1. Result of the calibration measurement of HPGe detector
radioactive source energy/keV FWHM/MeV detection efficiency/% Co-57 122.06 2.74×10−3 0.239 136.47 2.67×10−3 0.274 Co-60 1173.24 3.44×10−3 0.057 1332.51 3.51×10−3 0.052 Cs-137 661.66 3.36×10−3 0.092 Na-22 1274.54 3.17×10−3 0.054
Table 2. Simulated detection efficiency results of HPGe detector with different dead layer thickness
View tableView in ArticleTable 2. Simulated detection efficiency results of HPGe detector with different dead layer thickness
E/keV experimental detection efficiency/% simulated detection efficiency at different dead layer/% 0.05 cm 0.07 cm 0.10 cm 0.12 cm 0.17 cm 0.22 cm 122.06 0.278 0.230 0.273 0.264 0.250 0.228 0.208 136.47 0.275 0.293 0.283 0.288 0.264 0.245 0.227 511.00 0.128 0.078 0.119 0.116 0.116 0.112 0.108 661.66 0.092 0.098 0.098 0.091 0.095 0.092 0.089 1173.24 0.058 0.031 0.063 0.062 0.062 0.060 0.059 1274.54 0.055 0.021 0.060 0.058 0.058 0.056 0.055 1332.51 0.052 0.029 0.057 0.056 0.056 0.054 0.053
Table 3. Dose rate of conversion of complete spectra without deconvolution method and simulation of energy group No. 2
View tableView in ArticleTable 3. Dose rate of conversion of complete spectra without deconvolution method and simulation of energy group No. 2
average energy/MeV simulated dose rate/(nGy·h−1) dose rate of conversion of complete spectra without deconvolution method /(nGy·h−1) residue/ (nGy·h−1) 0.055 1.80×10−5 1.80×10−5 0 0.070 1.72×10−5 1.72×10−5 0 1.000 2.20×10−5 2.20×10−5 0 0.125 2.82×10−5 2.82×10−5 9.83×10−20 0.170 4.11×10−5 4.11×10−5 9.49×10−20 0.662 2.00×10−3 2.00×10−3 0 1.250 3.44×10−3 3.44×10−3 9.97×10−18
Table 4. The results of measuring the dose rate of Co-60 and Cs-137 in a 10 L spherical ionization chamber at different distances
View tableView in ArticleTable 4. The results of measuring the dose rate of Co-60 and Cs-137 in a 10 L spherical ionization chamber at different distances
radioactive source distance/m measured dose rate/(nGy·h−1) standard value of dose rate/(nGy·h−1) relative error of measured value and standard value/% Cs-137 3.0 5343 5397 −1.001 Cs-137 3.5 3965 3962 0.076 Cs-137 4.0 3018 3028 −0.330 Cs-137 4.5 2395.5 2396 −0.021 Co-60 3.0 1368 1355.4 −0.921 Co-60 3.5 1005 988.5 −1.642 Co-60 4.0 769 776.1 0.923 Co-60 4.5 607 602.55 −0.733
Table 5. Comparison of dose rate of Conversion of complete spectra without deconvolution method and the standard value
View tableView in ArticleTable 5. Comparison of dose rate of Conversion of complete spectra without deconvolution method and the standard value
radioactive source distance/m dose rate of conversion of complete spectra without deconvolution method/(nGy·h−1) live time rate/% standard value of dose rate/(nGy·h−1) relative error of calculated value and standard value/% Cs-137 3.0 6115.9 0.55 5830.0 8.02 Cs-137 3.5 4497.1 0.63 4286.5 8.19 Cs-137 4.0 3372.5 0.72 3214.1 6.15 Cs-137 4.5 2688.6 0.75 2562.1 6.93 Co-60 3.0 1363.1 0.92 1339.7 −2.07 Co-60 3.5 1010.5 0.93 993.0 −1.20 Co-60 4.0 770.5 0.95 757.0 −1.56 Co-60 4.5 609.7 0.96 598.9 −1.33
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Lei Cao, Yaofeng Zhang, Yang Yang, Jianwei Huang, Xiaole Zhang. Measurement of environmental level X, γ dose with conversion of complete spectra without deconvolution method of MC simulation[J]. High Power Laser and Particle Beams, 2022, 34(2): 026005
Paper Information
Category: Monte Carlo Methods and Applications
Received: Jul. 20, 2021
Accepted: --
Published Online: Jan. 26, 2022
The Author Email: Huang Jianwei (huangjw@nim.ac.cn)
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