LI De-hong1,HUANG Jian-wei1,Shabiha Tuerxun2,WU Qi3
1. Nations Institute of Metrology, Beijing 100029, China
2. Xinjiang Uygur Autonomous Region Research Institute of Measurement and Testing, Uruqi, Xinjiang 830011, China
3. University of South China, Hengyang, Hunan 421001, China
Abstract：In the process of establishing the primary standards of air kerma, the g factor is one of the key components,which is involved in the value recurrence and uncertainty calculation, and the calculation of g factor required the mass energy transfer coefficient and mass energy absorption of the photon. The results were got and compared by using different software to simulate with different parameter settings. The results show that the calculation results from EGSnrc are more reasonable, especially for low-energy photons, although the g factor is relatively small. The values obtained under different parameter setting conditions are quite different. Therefore, attention should be paid to the physical mechanism of the relevant interactions in the process of the calculation and the use of the mass-energy transmission coefficient and the mass-energy absorption coefficient for low-energy photons.
李德红,黄建微,沙比哈·吐尔逊,吴琦. g因子的蒙特卡罗模拟计算[J]. 计量学报, 2019, 40(5): 920-923.
LI De-hong,HUANG Jian-wei,Shabiha Tuerxun,WU Qi. Monte Carlo Simulation Method for g Factor. Acta Metrologica Sinica, 2019, 40(5): 920-923.
［1］Burns D T, Büerman L. Free-air ionization chambers ［J］. Metrologia, 2009, 46(2): S9–23.
［2］Büerman L, Burns D T. Air-kerma cavity standards ［J］. Metrologia, 2009, 46(2): S24–S38.
［3］The online BIPM key comparison database (KCDB) contains Appendix B (Key and Supplementary Comparisons) and Appendix C (CMCs) of the CIPM MRA［EB/CD］. http://kcdb.bipm.org, 2018-10-20.
［4］李德红, 王培玮, 邬蒙蒙, 等. 137Cs γ射线空气比释动能基准石墨空腔电离室的研制［J］. 计量学报2016, 37(3): 323-327.
Li D H,Wang P W,Wu M M, et al. Construction on Graphite Cavity Ionization Chamber as Air Kerma Primary Standard for 137Cs γ Rays［J］. Acta Metrologica Sinica, 2016, 37(3): 323-327.
［5］邬蒙蒙, 李德红, 王培伟. 圆柱型空腔电离室修正系数的Monte Carlo 模拟与实验验证［J］. 计量学报2016, 37(2): 214-218.
Wu M M, Li D H, Wang P W. Monte Carlo Simulation and Experimental Validation of Correction Factor for Cylindrical Cavity Ionization Chamber［J］. Acta Metrologica Sinica, 2016, 37(2): 214-218.
［6］Mcnair A. ICRU Report 33-Radiation Quantities and Units Pub: International Commission on Radiation Units and Measurements［R］. Washington DC, USA: 1980.
［7］Hubbell J, Seltzer S. Tables of X-ray mass attenuation coefficients and mass energy-absorption coefficients 1keV to 20MeV ［J］. Int J Appl Radiat Isot,1982, 33: 1269-1290.
［8］Kawrakow I, Rogers D. Monte Carlo Simulation of Electron and Photon Transport:The EGSnrc Code System ［R］. NRCC Ottawa, Canada: 2015.
［9］XMuDat: Photon attenuation data on PC［EB/CD］. https://www-nds.iaea.org/publications/iaea-nds/iaea-nds-0195.htm, 2018-10-20.
2019, Vol. 40 
