论文部分内容阅读
目前,我国尚未建立关于质子吸收剂量测量标准,本工作参照ICRU59号报告和IAEA的TRS398号报告,建立了1套基于电离法的质子剂量校准系统。该系统主要由束斑观测单元、束斑散射单元、透射电离室束流监测单元、石墨平板电离室测量单元及丙氨酸剂量计辐照单元等组成。本工作设计加工了石墨平板电离室,以德国PTW公司生产的UNIDOSE剂量仪作为读数系统,利用本单位的60Coγ射线参考辐射场在空气中对石墨平板电离室测量单元进行了校准,获得空气比释动能校准因子,进而获得电离室中灵敏体积空气的质量。同时利用该参考辐射场对平板电离室测
At present, our country has not yet established the measurement standard of the dose of proton absorption. In this work, referring to the report of ICRU59 and IAEA TRS398, a set of proton dose calibration system based on ionization method was established. The system mainly consists of a beam spot observation unit, a beam spot scattering unit, a transmission ionization chamber beam current monitoring unit, a graphite plate ionization chamber measuring unit and an alanine dosimeter irradiation unit. In this work, we design and process graphite plate ionization chamber. Using the UNIDOSE dosimeter manufactured by Germany PTW as the reading system, we calibrate the measuring unit of graphite plate ionization chamber in air by using 60Co γ ray reference radiation field of our unit, Kinetic energy calibration factor, and then obtain the ionization chamber sensitive volume of air quality. At the same time using the reference radiation field measured on the plate ionization chamber