北京地区医用加速器高能光子水吸收剂量398、277报告的量值验证

doi:10.3969/j.issn.1000-1158.2021.01.16

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摘要针对我国放疗水吸收剂量测量方法即将更新的现状,先后在北京多家医院放疗科的医用加速器下进行了200多次高能光子水吸收剂量量值验证实验。按照IAEA 277报告和IAEA 398报告的测量方法,测量高能光子最大剂量点处的水吸收剂量值并进行比较。统计2种方法测量结果的偏差,在NE2571电离室的实验结果中,398报告的测量结果比277报告的测量结果大0.23%;在PTW30013电离室的实验结果中,398报告的测量结果比277报告的测量结果测量结果大0.85%。实验表明,2种方法的测量结果在不确定度范围内一致,实验为398报告量值体系在我国的推行建立了实验基础。对结果的偏差做了分析,深入研究了相关因子的计算过程,从几个修正因子的角度探讨了偏差产生的原因。

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	罗琛
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关键词 ：计量学, 水吸收剂量, 医用加速器, IAEA 277报告, IAEA 398报告

Abstract：In view of the absorbed dose to water measurement method in China is about to be updated, more than 200 value verification experiment in high-energy photon beams have been carried out under the medical accelerators of the radiation department in several hospitals in Beijing. According to the measurement methods reported by IAEA 277 and IAEA 398, the dose values at the maximum dose point of high-energy photons were measured and compared. In the NE2571 ionization chamber, the result measured by 398 report was 0.23% higher than that by 277 report, and this ratio was 0.85% in the PTW30013 ionization chamber. The experiment showed that the measurement results of the two methods were consistent within the uncertainty range, and the experiment established the experimental basis for the implementation of the 398 value system in China. The deviation of the results was analyzed, the calculation process of the correlation factors was studied , and the causes of the deviation were discussed from the perspective of several correction factors.

Key words： metrology absorbed dose to water medical accelerators IAEA 277 report IAEA 398 report

收稿日期: 2019-10-12 发布日期: 2021-01-19

PACS:

TB98

基金资助:国家质量基础的共性技术研究与应用(2017YFF0210804)

通讯作者: 王坤(1980-),男,辽宁朝阳人,中国计量科学研究院副研究员,博士,主要从事辐射剂量学研究。Email:wangkun@nim.ac.cn E-mail: wangkun@nim.ac.cn

作者简介: 罗琛(1983-),男,北京人,北京市计量检测科学研究院高级工程师,主要从事辐射剂量学方面的研究。Email:luochen@bjjl.cn

引用本文:

罗琛,范耀东,王坤,王焕宁,鲁向,赵贵坤. 北京地区医用加速器高能光子水吸收剂量398、277报告的量值验证[J]. 计量学报, 2021, 42(1): 100-104.
LUO Chen,FAN Yao-dong,WANG Kun,WANG Huan-ning,LU Xiang,ZHAO Gui-kun. Comparation on the Absorbed Dose to Water in 398/277 Report for Linac's High Energy Photon Beams in Beijing District. Acta Metrologica Sinica, 2021, 42(1): 100-104.

链接本文:

http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.01.16 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I1/100

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