多层平板电离室测量不同材料界面剂量分布及其蒙特-卡洛模拟

研究设计了多层平板铝电离室.用该电离室测量了30—100keV宽谱同步辐射X射线在Kovar/Au/Al,Pb/Al,Ta/Al界面附近的辐射剂量梯度分布,给出了不同材料界面剂量增强因子(dose enhancement fctor)(DEF).理论上用蒙特卡洛粒子输运方法模拟计算了实测模型下的不同材料的界面剂量增强因子,实验结果与理论模拟符合很好.为研究不同材料的剂量增强提供了理论和实验手段 关键词： 多层平板电离室 剂量增强 蒙特卡-洛模拟

USING MULTIPLE PARALLEL PLATE ALUMINUM IONIZATION CHAMBER FOR DETERMINING DOSE DISTRIBUTION AT AND NEAR THE INTERFACE OF DIFFERENT MATERIALS AND ITS MONTE CARLO SIMULATION

A multiple parallel plate aluminum ionization chamber has been designed for the study of dose distribution at and near the interface of different materials.The measurement of dose gradient distribution at and near the interface of Kovar/Au/Al,Pb/Al,Ta/Al has been done for 30—100 keV X rays from the synchrotron radiation source, and the dose enhancement factor(DEF) are also provided. DEF for interface of different materials is calculated by Monte-Carlo simulation of particle transportation, and the results are consistent with the measured dose-enhancement factor. A reliable evaluation approach of theoritival and experimental method is proposed for studying X-ray dose enhancement.