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

Abstract

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. numerical simulation, POM, caesium-137, MCNP, absorbed dose, effective dose

Numerical Simulation of Dispersion of Radionuclides Released from the Fukushima NPP and the Assessment of their Nuclear Impact

“…We used MCNP 5 [12] to research the external dose of radionuclides in sea water. The detailed method was described elsewhere [4]. The Cs-137 emits a 662keV γ-ray during its decay.…”

“…Numerical simulation is a feasible and economical method to solve this problem. Many oceanic circulation models have been utilized to simulate the radionuclides discharged from Fukushima Daiichi NPP (F1NPP) [1][2][3][4]. In this article, we employ the Regional Oceanic Modeling System (ROMS) [5] to simulate the circulation of the sea water around Japan.…”