医用电子加速器高能光子水吸收剂量溯源
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摘要
采用直接法测量医用电子加速器高能光子水吸收剂量,与我国现行的从空气比释动能转化为水吸收剂量间接法测量的结果进行比较。结果表明,两种方法测量结果相差1%以内,同时用传递比较法进行了验证。证明我国基于加速器光子水吸收剂量基准而建设的水吸收剂量溯源体系是可行的,为我国水吸收剂量直接测量提供依据。
Results obtained by direct measurement of absorbed dose to water for medical electron accelerators were compared with that by indirect measurements(through converting the measured air kerma into absorbed dose to water). Experiments results demonstrate that the difference between two methods is within 1%, it is validated by the transfer comparison method meanwhile. It is demonstrated that the absorbed dose to water traceability system based on the photon absorbed dose to water for the accelerator is feasible. This provides the basis for direct measurement of absorbed dose to water for accelerators.
Results obtained by direct measurement of absorbed dose to water for medical electron accelerators were compared with that by indirect measurements(through converting the measured air kerma into absorbed dose to water). Experiments results demonstrate that the difference between two methods is within 1%, it is validated by the transfer comparison method meanwhile. It is demonstrated that the absorbed dose to water traceability system based on the photon absorbed dose to water for the accelerator is feasible. This provides the basis for direct measurement of absorbed dose to water for accelerators.
引文
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3 International Atomic Energy Agency.Absorbed dose determination in external beam radiotherapy:an international code of practice for dosimetry based on standards of absorbed dose to water,technical report series No.398[S].Viena,IAEA,2000.
4 张圆月,杨勇,黄扬,等.医用高能光子水吸收剂量测量规范TRS-277与TRS-398比较[J].中国测试技术,2009,35(2):14-17.ZHANG Yuanyue,YANG yong,HUANG Yang,et al.Comparison between TRS-277 and TRS-398:absorbed dose to water for clinical high-energy photon beams[J].China Measurement&Testing Technology,2009,35(2):14-17.
5 全国法制计量管理技术委员会.JJF1033-2016计量标准考核规范[S].北京:中国质检出版社,2016.National Legal Metrology Management Technical Committee.JJF1033-2016 rule for the examination of measurement standards[S].Beijing:China Quality Inspection Publishing House,2016.