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作 者:滕忠斌 宋明哲[1] 魏可新[1] 杭仲斌 耿璇 高飞[1] 刘蕴韬[1] 刘森林[1] TENG Zhongbin;SONG Mingzhe;WEI Kexin;HANG Zhongbin;GENG Xuan;GAO Fei;LIU Yuntao;LIU Senlin(National Key Laboratory for Metrology and Calibration Techniques,China Institute of Atomic Energy,Beijing 102413,China)
机构地区:[1]中国原子能科学研究院计量与校准技术重点实验室,北京102413
出 处:《哈尔滨工程大学学报》2022年第11期1604-1610,共7页Journal of Harbin Engineering University
摘 要:为了获得具有更小测量不确定度的剂量转换系数和避免复杂的能谱解析过程,本文利用蒙特卡罗方法计算了诊断X射线辐射场中运行实用量H_(p)(3) 和D_(p lens)的转换系数。在EGSnrc中建立照射装置和计算体模的精细模型,然后分别计算不同照射条件下空气比释动能K_(air)到H_(p)(3) 、D_(p lens)的转换系数,并与能谱解析结果比较。结果显示2种转换系数的模拟值与解析值的最大相对偏差分别为3.12%(RQR4,75°)和2.91%(RQR4,90°),均在解析值的不确定度范围内。本文提出的模拟方法准确可靠,可以帮助校准实验室快速获得具有更小测量不确定度的眼晶状体剂量转换系数,为建立相关量值溯源体系提供技术支撑。To obtain the dose conversion coefficients with small uncertainty of measurement and avoid a complicated energy spectrum analysis process,the Monte Carlo method is used in this study to calculate the conversion coeffi-cients of the operational quantities H_(p)(3) and D_(p lens) for diagnostic X-ray radiation fields.The irradiation facility and the calculation phantoms are comprehensively modeled in EGSnrc.For different irradiation conditions,the dose conversion coefficients from air kerma to H_(p)(3) and D_(p lens) are then calculated,which are further compared with the spectrum analysis values.The result shows that the maximum relative deviations between the simulated and analyti-cal values of the two conversion coefficients are 3.12%(RQR4,75°)and 2.91%(RQR4,90°),respectively,which are within the uncertainties of the analytical values.Moreover,the proposed simulation method is accurate and reliable.The method can help the calibration laboratory obtain the lens dose conversion coefficients with a small uncertainty rapidly,providing technical support for the establishment of the traceability system for relative quantities.
关 键 词:剂量转换系数 能谱解析 眼晶状体剂量学 RQR辐射质 EGSNRC 测量不确定度 ICRU95运行实用量 剂量测量
分 类 号:TL72[核科学技术—辐射防护及环境保护]
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