| SUN Ji-ning,LIU Jian-chang,YANG Xiao-yuan,et al.Wall correction factors of sphere-cylindrical graphite ion chamber by Monte Carlo simulation[J].Chinese Journal of Radiological Medicine and Protection,2007,27(6):577-581 |
| Wall correction factors of sphere-cylindrical graphite ion chamber by Monte Carlo simulation |
| Received:January 04, 2007 |
| DOI： |
| KeyWords:Graphite ion chamber Air-kerma Wall correction factor Kwall Monte Carlo simulation EGSnrc |
| FundProject:国家自然科学基金资助项目(10275058) |
| Author Name | Affiliation | E-mail | | SUN Ji-ning | Institute of Heavy Ion Physics and MOE Key Lab of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China | | | LIU Jian-chang | Institute of Heavy Ion Physics and MOE Key Lab of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China | | | YANG Xiao-yuan | 中国计量科学研究院电离辐射与医学工程计量科学研究所 | | | 杨元第 | 中国计量科学研究院电离辐射与医学工程计量科学研究所 | | | 胡家成 | 中国计量科学研究院电离辐射与医学工程计量科学研究所 | | | 叶卫国 | Institute of Heavy Ion Physics and MOE Key Lab of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China | | | 黄斐增 | Institute of Heavy Ion Physics and MOE Key Lab of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China | | | 樊铁栓 | Institute of Heavy Ion Physics and MOE Key Lab of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China | tsfan@pku.edu.cn |
|
| Hits: 3841 |
| Download times: 2299 |
| Abstract:: |
| Objective In order to establish the criterion of air-kerma of 10 cm3 NIM sphere-cylindrical graphite ion chamber in a 60Co beam, the wall correction factor Kwall was calculated by the Monte Carlo simulation.Methods Several subroutines, such as D|S HOWFAR, D|S HOWNEAR, and some others related in EGSnrc, were rewritten to make the user codes applicable for any sphere-cylindrical geometry.Results The wall correction factor Kwall of 10 cm3 NIM sphere-cylindrical graphite ion chamber in a 60Co beam was calculated by Monte Carlo simulation, and the result compared was with the experimental data. The comparison shows that the present result of Monte Carlo simulation accords with the BNMI-LNHBs and the "mean equivalent thickness" values in a precision of 0.01% and 0.02%, respectively, higher than the value obtained by the traditional linear extrapolation by 0.47%.Conclusions The value for Kwall of 10 cm3 NIM sphere-cylindrical graphite ion chamber in a 60Co beam from Monte Carlo simulation 1.0166(standard uncertainty 0.0004). |
| HTML View Full Text View/Add Comment Download reader |
| Close |
|
|
|
