作者：张园月, 杨勇, 黄扬, 鄢玲, 林滔

作者单位：中国测试技术研究院, 四川成都 610021

关键词：TRS-277; TRS-398; 吸收剂量; 高能光子

摘要：

随着吸收剂量测量及其量值溯源理论和技术的发展,国际原子能机构先后发布了TRS-277、TRS-398号报告,规范了高能光子水中吸收剂量的测量,以满足临床应用时不确定5.0%(k=2)的要求。文中依据两个报告,从量值溯源方式、测量方法、参数引用、修正因子的来源及其确定等方面,比较了两个报告在高能光子水中吸收剂量测量中的使用差异;同时指出了应用TRS-398号报告能进一步减少测量结果的不确定度,对开展精确放射治疗具有指导意义。

Comparison between TRS-277 and TRS-398:absorbed dose to water for clinical high-energy photon beams

ZHANG Yuan-yue, YANG Yong, HUANG Yang, YAN Ling, LIN Tao

National Institute of Measurement and Testing Technology, Chengdu 610021, China

Abstract: With the advanced development on the theory and technology of the absorbed radiation dose measurement and traceability, the International Atomic Energy Agency has released the Report TRS-277 and TRS-398 for standardizing absorbed dose measurement in the water for high-energy photon beams to meet the requirements in clinical application of uncertainty 5.0% (k=2). According to the two reports, the absorbed dose measurement differences in the water for high-energy photon beams are compared in term of the traceability, the measurement methods, the parameters used, the correction factors by used and so on. At the same time, it is pointed that the impact of uncertainty is less for the absorbed dose measurement in the water with the report TRS-398 and there is important guiding significance for carrying out precision radiation therapy.

Keywords: TRS-277; TRS-398; Absorbed dose; High-energy photon beam

2009, 35(2): 14-17  收稿日期: 2008-8-26;收到修改稿日期: 2008-11-7

基金项目: 国家科技条件平台项目(2005DKA10709)

作者简介: 张园月(1965-),男,四川平昌人,高级工程师,主要从事电离辐射计量检测与研发工作。

参考文献

[1] ICRU Report 24:1976,Determination of absorbed dose in a patient irradiated by beams of X or gamma rays in radiotherapy procedures[S]. ICRU,Bethesda,1976.
[2] IAEA Technical Report Series No.277: 1996, Absorbed dose determination in photon and electron beams: an international code of practice(2nd Edition)[S]. IAEA Tech. Vienna: IAEA, 1996.
[3] IAEA Tech. Report Series No.277:1998,Dose determin ation in photon and electron beams:an adaptation of the IAEA International Codes of Practice(2nd Edition)[S]. Vienna:IAEA,1998.
[4] IAEA Technical Report Series No.381:1997, The use of plane-parallel ionization chambers in high-energy electron and photon beams. An International Code of Practice for Dosimetry[S]. Vienna, IAEA, 1997.
[5] IAEA Technical Report Series No.398:2000, Absorbed dose determination in external beam radiotherapy. An international code of practice for dosimetry based on standards of absorbed dose to water[S].Vienna, IAEA,2000.
[6] IAEA Tech.Report Series No.398:2004,An international code of practice for dosimetry based on absorbed dose to water IAEA Absorbed dose determination in external beam radiotherapy[S]. Vienna, IAEA,2004.
[7] JJG912-1996,治疗水平电离室剂量计[S].北京:中国计量出版社,1997.
[8] JJG589-2001,外照射治疗辐射源[S].北京:中国计量出版社,2001.
[9] 黄杨.X、γ射线照射量(治疗水平)标准装置技术研究[J].中国测试技术,2005,31(6):32-35.
[10] 黄杨.治疗水平剂量计校准因子不确定度评定的探讨[J].中国测试技术,2008,34(4):35-38.