基于MCNP对γ射线吸收剂量累积因子的计算与研究
发布时间:2018-06-22 19:01
本文选题:累积因子 + MCNP ; 参考:《辐射防护》2017年03期
【摘要】:使用蒙特卡罗程序MCNP计算了常用材料下的吸收剂量累积因子,计算时采用了较新的截面数据库MCPLIB04及介质材料的衰减参数数据库,并考虑了轫致辐射和相干散射等物理过程,同时将计算结果与相关文献给出的数据进行了比较,分析了造成差异的主要原因。结果表明:利用MCNP计算出的低Z材料的吸收剂量累积因子值在入射光子的中能区部分,平均比文献给出的数据偏小,在高能区部分平均比其偏大;而利用MCNP计算出的高Z材料的吸收剂量累积因子则普遍比文献给出的数据偏大。本文工作可为更新目前使用的较为陈旧的累积因子数据库提供参考。
[Abstract]:Monte Carlo program MCNP is used to calculate the absorption dose accumulation factor in common materials. A new cross section database, MCPLIB04, and the attenuation parameter database of dielectric materials are used, and the physical processes such as Bremsstrahlung and coherent scattering are considered. At the same time, the calculation results are compared with the data given in related literature, and the main reasons for the difference are analyzed. The results show that the accumulative factor value of absorbed dose of low Z material calculated by MCNP is smaller than that in the middle energy region of incident photon and larger than that in high energy region. However, the accumulative factor of absorbed dose calculated by MCNP for high Z material is generally larger than that given in literature. This work can provide a reference for updating the old cumulative factor database.
【作者单位】: 中国辐射防护研究院保健物理研究所剂量学研究室;清华大学工程物理系粒子技术与辐射成像教育部重点实验室高能辐射成像重点学科实验室;
【基金】:国家自然科学基金资助项目(项目编号:11305146、11275174)
【分类号】:TL752
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本文编号:2053893
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