空间设定差异对蒙特卡罗方法计算比吸收分数精度和效率的影响

doi:10.13491/j.issn.1004-714X.2022.05.014

中国辐射卫生

2022, Vol. 31

Issue (5): 597-600 DOI: 10.13491/j.issn.1004-714X.2022.05.014

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空间设定差异对蒙特卡罗方法计算比吸收分数精度和效率的影响

张卫媛, 卓维海, 陈波, 季华钧

复旦大学放射医学研究所，上海 200032

Effects of grid methods on precision and efficiency of specific absorbed fraction calculation in Monte Carlo simulation

ZHANG Weiyuan, ZHUO Weihai, CHEN Bo, JI Huajun

Institute of Radiation Medicine, Fudan University, Shanghai 200032 China

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摘要目的比较2类栅元法计算参考人比吸收分数的计算结果精确度和计算时间代价。方法基于国际放射防护委员会提供的体素化成年女性参考人模体，以肝脏为源器官发射0.5 MeV单能光子为例，利用MCNP6.0^{^®}的F4、F6和*F8卡，采用网格法和重复结构晶格法计算各个靶器官/组织的比吸收分数（Specific Absorbed Fraction, SAF），以计算结果和计算时间为评估参数，研究27个器官/组织的SAF值。结果与已知计算结果比较，除眼晶状体和皮肤外，当前研究结果得到25个器官/组织SAF值的相对偏差绝对值均小于5%。基于重复结构晶格的*F8卡计算结果各器官相对偏差均最小，但计算时间也最长；基于网格法F4卡计算时间比基于重复结构晶格的F6卡的计算时间稍长，F6晶格法的计算时间最短。各卡计算结果的标准误差在±5%内。结论在计算结果上，同时模拟计算初级和次级粒子输运的*F8卡的精度最高；在同类计数卡中，使用网格法所需的计算时间较使用晶格法长。

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	张卫媛
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关键词 ：比吸收分数, 蒙特卡洛方法, 网格法, 重复结构晶格法

收稿日期: 2022-03-26

PACS:

R144.1

基金资助:上海市卫生和计划生育委员会青年项目（2017Y0140）

通讯作者: 卓维海，E-mail：whzhuo@ fudan.edu.cn E-mail: whzhuo@ fudan.edu.cn

作者简介: 张卫媛（1986—），女，河南周口人，实验师，从事放射卫生与辐射防护工作。E-mail：wyzhang@ fudan.edu.cn

引用本文:

张卫媛, 卓维海, 陈波, 季华钧. 空间设定差异对蒙特卡罗方法计算比吸收分数精度和效率的影响[J]. 中国辐射卫生, 2022, 31(5): 597-600.
ZHANG Weiyuan, ZHUO Weihai, CHEN Bo, JI Huajun. Effects of grid methods on precision and efficiency of specific absorbed fraction calculation in Monte Carlo simulation. Chinese Journal of Radiological Health, 2022, 31(5): 597-600.

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http://www.zgfsws.com/CN/10.13491/j.issn.1004-714X.2022.05.014 或 http://www.zgfsws.com/CN/Y2022/V31/I5/597

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