质子束布拉格峰测量

Measurement of Proton Bragg Peak

基于100MeV回旋加速器质子束流,参考IAEATRS-398号报告,开展质子束布拉格峰测量。基于水吸收剂量测量原理及影响因素,选择合适水箱尺寸及电离室型号。基于空腔理论,及质子与物质相互作用原理,利用PTW-30013指型电离室、MP3-P三维扫描水箱配合MEPHYSTONavigator软件测量经石墨降能器扩展后的布拉格峰。测量同一实验条件下质子束百分深度剂量曲线,并利用软件对测量数据进行分析,将最高剂量作为归一点,得到该质子束流布拉格峰位、峰宽、实际射程、剩余射程及坪区高度等辐射质参数。该质子束布拉格峰宽约为1.21 mm,参考深度约为43.63mm。

Based on the proton beam of the newly built 100MeV cyclotron,according to IAEA TRS-398 report,proton beam Bragg peak measurement was carried out.Considering the principle of water absorption dose measurement and influencing factors,appropriate water phantom and ionization chamber were selected..Based on Bragg⁃Gray cavity theory and proton⁃matter interaction principle,the percentage depth dose curve of proton beam extended by graphite energy degarder was measured by PTW-30013 ionization chamber,MP3-P three⁃dimensional scanning water phantom and MEPHYSTO Navigator software.The percentage depth dose curve of proton beam was measured under the same experimental condition,the measurements were analyzed by software,with highest dose as a baseline the radiation parameters such as Bragg peak,peak width,pratical range,residual range and plateau height of the proton beam are obtained,The Bragg peak width of the proton beam is about 1.21 mm,and the reference depth is about 43.63 mm.