摘要
目的 :介绍美国医学物理学家协会 (AAPM)TG 5 1协议关于高能电子束吸收剂量的测定规程。 方法 :以本院实际使用的剂量仪和电离室 ,按照该协议推荐的方法测定医用直线加速器 6档高能电子束的吸收剂量。 结果 :对于 7、9、1 0和 1 2MeV ,TG 5 1与TG 2 1相比较 ,偏差在 - 0 .1 %～ 0 .7%之间 ,与JJG1 0 2 6 91相比 ,在 - 0 .3%～ 0 .4 %之间。对于 5和 6MeV分别为 1 .7%、1 .5 %和 - 1 .6 %、1 .7%。 结论 :TG 5 1规程理论严谨 ,表达简明 。
Objectives:To introduce a new calibration protocol for clinical reference dosimetry of high energy electron beams published by Radiation Therapy Task Group 51, American Association of Physicists in Medicine. Methods:According to the new protocol, measuring the absorbed dose of 5, 6, 7, 9, 10 and 12 MeV Electrons produced by the Siemens M6740 accelerator of our hospital with the help of the Capintec-192 electrometer and PR 06C chamber. Results:For 7-12 MeV, the discrepancies vary from -0.1% to 0.7% between TG 51 and TG 21, and from -0.3% to 0.4% between TG 51 and JJG1026 91. For 5 and 6 MeV, there are 1.7% and 1.5% discrepancies between TG 51 and TG 21, and -1.6% and 1.7% between TG 51 and JJG1026 91. Conclusions:The new protocol is more accurate and convenient because of its precise rationale and concise formulae.
出处
《医学研究生学报》
CAS
2003年第6期435-437,共3页
Journal of Medical Postgraduates
关键词
吸收剂量
测定规程
电子束
Absorbed dose
Dosimetry
Electron beam
