Absorbed dose response of Al2O3 dosimeter irradiated by 60Co γ spectrum source capture and collimators

VernacularTitle:Al2O3剂量计在准直60Co γ线中的吸收剂量响应
Author: Shaowen CHEN ; Qiang TANG ; Xiaowei LIU
Publication Type:Journal Article
Keywords: Monte Carlo simulations; Al2O3 dosimeter; Absorbed dose response; EGSnrc
From: Chinese Journal of Radiological Medicine and Protection 2009;29(1):91-93
CountryChina
Language:Chinese
Abstract: Objective To investigated the absorbed dose response of Al2O3 dosimeter in water phantom irradiated by 60Co γ spectrum source. Methods The EGSnre 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 eylindrieal 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 60Co γ spectrum source is steady and is independent on the depth of the dosimeter in water phantom in this research.