Al2O3剂量计在准直^60Coγ线中的吸收剂量响应  

Absorbed dose response of Al2O3 dosimeter irradiated by ^60Coγ spectrum source capture and collimators

作　　者：陈少文[1] 唐强[1] 刘小伟[1] 

机构地区：[1]中山大学物理科学与工程技术学院,广州510275

出　　处：《中华放射医学与防护杂志》2009年第1期91-93,共3页Chinese Journal of Radiological Medicine and Protection

基　　金：国家自然科学基金资助项目（10675175）;高等学校博士点基金资助项目（20050558034）

摘　　要：目的用MonteCado法研究Al2O3剂量计在准直^60Coγ线照射下在水中的吸收剂量响应特性。方法用EGSnrc／DOSRZnrc程序计算水体模中Al2O3剂量计的吸收剂量及剂量计相应位置上水的吸收剂量，并计算吸收剂量换算因子。剂量计元件用一个直径0．4cm高0．1cm的圆柱形Al2O3薄片表示，计算深度0．5—8．0cm，入射粒子是准直后的^60Coγ线。结果在研究的深度范围内，吸收剂量换算因子变化不大，平均值为1．143±0．006，最大偏差不大于1．0％。结论在研究范围内，^60Coγ线中Al2O3剂量计的吸收剂量响应与剂量计在水体模中的深度无关，剂量响应稳定。Objective To investigated the absorbed dose response of Al2O3 dosimeter in water phantom irradiated by ^60Coγ spectrum source. Methods The EGSnrc simulation program code DOSRZnrc was used to calculate the absorbed dose of the Al2O3 dosimeter and that of the equivalent volume of water in the corresponding position, as well as the absorbed dose conversion factor, irradiated by ^60Co photon beams in a water phantom. Simulations were done for a cylindrical geometry dosimeter （diameter 0.4 cm and height 0.1 cm） and the dosimeter was placed at the centre of the water phantom at different depths. Results The average absorbed dose conversion factor is 1. 143 ± 0.006 and changes little with the depth of the dosimeter in the water phantom, and the deviation is less than 1.0 %. Conclusion The absorbed dose response of Al2O3 dosimeter irradiated by ^60Coγ spectrum source is steady and is independent on the depth of the dosimeter in water phantom in this research.

关 键 词：蒙特卡罗模拟 Al2O3剂量计 吸收剂量响应 EGSnrc系统 

分 类 号：R144[医药卫生—公共卫生与预防医学]