Effects of grid methods on precision and efficiency of specific absorbed fraction calculation in Monte Carlo simulation
10.13491/j.issn.1004-714X.2022.05.014
- VernacularTitle: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
- Author:
Weiyuan ZHANG
1
;
Weihai ZHUO
1
;
Bo CHEN
1
;
Huajun JI
1
Author Information
1. Institute of Radiation Medicine, Fudan University, Shanghai 200032 China.
- Publication Type:Journal Article
- Keywords:
Specific absorbed fraction;
Monte Carlo method;
Mesh tally;
Repeated structure lattice tally
- From:
Chinese Journal of Radiological Health
2022;31(5):597-600
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the precision and efficiency of computing the specific absorbed fraction (SAF) of a reference human with two grid methods in MCNP6.0. Methods Based on the adult female reference voxel phantom provided by the International Commission on Radiological Protection, assuming the liver as the source organ emitting single-energy photons (0.5 MeV), the SAF of each target organ/tissue was calculated by using the mesh method and repeated structure lattice method with the F4, F6, and *F8 tally cards in MCNP6.0. We compared the methods by assessing the relative deviation of SAF and computing time for 27 organs/tissues. Results Compared with reported data, the absolute values of relative deviations of SAF values for all the organs/tissues were less than 5%, except for the eye lens and skin. By using the repeated structure lattice-based *F8 tally, the relative deviations of SAF values of the organs/tissues were all smallest, but with the longest computing time. The computing time of the mesh-based F4 tally was slightly longer than that of the repeated structure lattice-based F6 tally, which was shortest. Conclusion The *F8 tally simultaneously simulating primary and secondary particle transport showed the highest precision. The mesh tally requireda longer computing time than the lattice tally when using the same tally card.
