| 球形石墨空腔电离室壁修正因子的Monte-Carlo模拟和实验测量 |
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| 引用本文： | 刘鉴常,孙吉宁,杨小元,郭彬,叶卫国,黄斐增,杨元第,胡家成,樊铁栓.球形石墨空腔电离室壁修正因子的Monte-Carlo模拟和实验测量[J].原子能科学技术,2006,40(6):723-728. |
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| 作者姓名： | 刘鉴常 孙吉宁 杨小元 郭彬 叶卫国 黄斐增 杨元第 胡家成 樊铁栓 |
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| 作者单位： | 1.北京大学 物理学院 重离子物理研究所 重离子物理教育部重点实验室，北京 ; 100871；2.中国计量科学研究院 电离辐射与医学处，北京 100013 |
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| 基金项目： | 国家自然科学基金(10275058) |
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| 摘 要： | 采用Monte-Carlo模拟和实验测量两种方法对30cm3球形石墨空腔电离室在60Coγ射线下的壁修因子Kwall进行研究。实验和模拟计算结果的比较表明，传统的线性外推法确定的壁修正能基准组的30cm3和50cm3球形石墨空腔电离室在60Coγ射线下的相对电离电流和壁修正因子进行了Monte-Carlo模拟计算，计算的相对电离电流值与NIST发布的实验测量值在0.12%内吻合。
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| 关 键 词： | 石墨电离室 空气比释动能 壁修正因子 Monte-Carlo模拟 |
| 文章编号： | 1000-6931（2006）06-0723-06 |
| 收稿时间： | 2005-03-05 |
| 修稿时间： | 2005-03-052005-12-26 |
Monte-Carlo Calculation and Measurement of Wall Correction Factor for Spherical Graphite Ionization Chamber |
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| LIU Jian-chang,SUN Ji-ning,YANG Xiao-yuan,GUO Bin,YE Wei-guo,HUANG Fei-zeng,YANG Yuan-di,HU Jia-cheng,FAN Tie-shuan.Monte-Carlo Calculation and Measurement of Wall Correction Factor for Spherical Graphite Ionization Chamber[J].Atomic Energy Science and Technology,2006,40(6):723-728. |
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| Authors: | LIU Jian-chang SUN Ji-ning YANG Xiao-yuan GUO Bin YE Wei-guo HUANG Fei-zeng YANG Yuan-di HU Jia-cheng FAN Tie-shuan |
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| Affiliation: | 1.Key Laboratory of Heavy Ion Physics of Ministry of Education, Institute of Heavy Ion Physics,School of Physics, Peking University, Beijing 100871,China;
2.Department of Ionization Radiation & Medicine National Institute of Metrology,Beijing 100013, China |
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| Abstract: | The factor Kwall to correct for photo attenuation and scatter in the wall of the 30 cm3 and 10 cm3 spherical chambers at National Institue of Metrology for 60Co air-kerma measurement is determined by Monte-Carlo calculation and experimental measurement. The calculation using the EGSnrc software system shows that the calculated wall correction factors differ by up to 1.0% from those obtained by linear extrapolations of the measured relative ionization current to zero wall thickness for the measured chambers. The relative ionization current and wall correction factors for the 30 cm3 and 50 cm3 spherical graphite chambers at NIST are calculated and compared with the measured results. The Monte-Carlo code can reproduce the experimental relative ionization current within an accuracy of ±0.12%. This work confirms that for spherical standard chambers the 60Co air-kerma reference values should be obtained by a new Kwall determined by Monte-Carlo calculations. |
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| Keywords: | graphite ionization chamber air-kerma wall correction factor Monte-Carlo calculation |
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