The numerical simulation of caesium-137 transportation in oceanand the assessment of its radioactive impacts after Fukushima NPP release  

作　　者：GUAN Yue SHEN ShiFei HUANG Hong 

机构地区：[1]Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University

出　　处：《Science China Earth Sciences》2015年第6期996-1004,共9页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.71373140);the State Key Laboratory of NBC Protection for Civilian(Grant No.SKLNBC0308);Tsinghua University Initiative Scientific Research Program(Grant Nos.2012Z10137,2012THZ0124)

摘　　要：After the damage of Fukushima Daiichi Nuclear Power Plant, a great number of radioactive materials were released into the Pacific Ocean. Therefore, it is necessary to research on the temporal and spatial distribution of these radionuclides. We use Princeton Ocean Model to simulate the circulation of the coast water of Fukushima NPP and obtain the concentration of caesium-137 by solving the diffusion equations. We employ the Monte Carlo N-particle(MCNP) code to assess the external doses caused by these contaminated sea water. To improve the efficiency and effectiveness of volume source in MCNP code, we establish a transformation method between spot source and volume source, and determine an appropriate range of volume source. Finally, we calculate the absorbed doses of every organ/tissue and the effective dose of a human body.After the damage of Fukushima Daiichi Nuclear Power Plant, a great number of radioactive materials were released into the Pacific Ocean. Therefore, it is necessary to research on the temporal and spatial distribution of these radionuclides. We use Princeton Ocean Model to simulate the circulation of the coast water of Fukushima NPP and obtain the concentration of cae- sium-137 by solving the diffusion equations. We employ the Monte Carlo N-particle （MCNP） code to assess the external doses caused by these contaminated sea water. To improve the efficiency and effectiveness of volume source in MCNP code, we es- tablish a transformation method between spot source and volume source, and determine an appropriate range of volume source. Finally, we calculate the absorbed doses of every organ/tissue and the effective dose of a human body.

关 键 词：numerical simulation POM caesium-137 MCNP absorbed dose effective dose 

分 类 号：X82[环境科学与工程—环境工程]