The Environmental Impact of Radiation from the 100 MeV Proton Accelerator Facility of PEFP

This study estimated the environmental effect of radiation from the 100 MeV proton accelerator facility based on the Monte Carlo method. Soil activation over a region of 5 in depth from the accelerator tunnel, and a groundwater migration of the produced radionuclides were calculated. A soil activity was 2.98 x 10(-4) Bq/cm(3) at the point of saturation. The groundwater migration of Na-22 induced an initial concentration as 1.48 x 10(-5) pCi/ml/yr. The dose rates from the skyshine were reduced from 3.68 x 10(-1) mSv/yr to 2.28 x 10(-2) mSv/yr according to an increasing of distance from the boundary of the facility. The simulation time of the skyshine calculation was improved by applying the SSW/SSR option in MCNPX. Estimating the environmental effect of radiation including various types of effects, we concluded that the dose distribution was lower than the dose limit of the regulation for the general public.