COMPARISON OF ABSORBED DOSE MEASUREMENTS WITH AN EXTRAPOLATION CHAMBER AND A FARMER CHAMBER IN HIGH ENERGY ELECTRON BEAM

In this paper, the comparison of absorbed dose measurement performed with an extrapolation chamber and a Fanner chamber in high energy electron beam is described. The experiments performed in the course of this work show that the Xinjiang extrapolation chamber is suitable for calibration of high energy electron beams produced from medical linear accelerators.

医用电子束吸收剂量测量中的平行板电离室校准

基于平板电离室的结构和物理特性,比圆柱形电离室更适用于电子束的水中吸收剂量测量,特别是在能量相对较低的电子束测量中更具优越性。介绍了基于两种量传体系的平板电离室溯源方式,提出了在现场如何利用已知校准因子的参考电离室得到平板电离室的校准因子的方法。在国内尚未建立水吸收剂量量传体系时,借助该方法可获得平板电离室水吸收剂量校准因子,据此按照TRS-398报告开展高能电子束水中吸收剂量测量,进一步减小测量结果的不确定度。