中文摘要：

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。

英文摘要：

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.