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Development of depth dose meter for heavy ion particle beams with piled plastic scintillators

堆积塑料闪烁体重离子粒子束深度剂量计的研制

基本信息

批准号：
07507005
负责人：
INOUE Toshihiro
金额：
$ 1.28万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

We continued to test the new developed depth dose meter. The dosimeter was exposed to x rays (4,10 and 18 MV) and electron beams (6,9,12 and 15 MeV) from Linac at the Osaka University Hospital, proton beams (65 and 200 MeV) from the cyclotron at RCNP of Osaka University and carbon beam (290MeV/n) from the Heavy Ion of Medical Accerator in Chiba of NIRS to test it. The pressed type of fiberblock without heat is more suitable for sensor than that with heat in respect of shielding the light. We could decrease the background signal in obtaining the image data by utilizing the digital filter. The fitness was good between the depth dose data by ionization chamber and by new dosimeter after compensating Cerenkov light for X ray and electron beam, quenching of light by energetic proton beams. The discrepancy became smaller by compensating the characteristics of emission of light from fiberblock. We could measure the depth dose curve for mono peak beam of carbon. But the discrepancy was large for spread outed carbon beams containing different components of LET.There are much room for improvement. After confirming the high quality of depth dose meter by correcting the difference of light emission by variable particles, we have a plan to make more compact 3D depth dose meter with rotation and rectilinear motion of detector. Such a new designed dosimeter will be useful because of reducing time for measurement of the fundamental dose distribution.

我们继续测试新开发的深度剂量计。剂量计接受来自大阪大学医院直线加速器的X射线(4，10和18 MV)和电子束(6，9，12和15 MeV)，来自大阪大学RCNP回旋加速器的质子束(65和200 MeV)和来自NIRS千叶医用加速器重离子的碳束(290 MeV/n)进行测试。在屏蔽光线方面，无热压制式比有热压制式更适合传感器。利用数字滤波可以降低图像数据获取过程中的背景信号。在X射线和电子束对切伦科夫光进行补偿、高能质子束猝灭光后，电离室测量的深度剂量数据与新剂量仪测量的剂量数据吻合较好。通过补偿光纤块的发光特性，减小了误差。我们可以测量单峰碳束的深度剂量曲线。但对于含有不同LET组分的散布碳束来说，差异很大，还有很大的改进空间。在通过修正不同粒子发光的差异来确定深度剂量计的高质量之后，我们计划制作更紧凑的具有探测器旋转和直线运动的三维深度剂量计。这种新设计的剂量计将是有用的，因为它减少了测量基本剂量分布的时间。