Abstract
Analytical formulas are derived for uncollided gamma-ray flux density and exposure rate above the ground due to 222Rn distributed in the soil exponentially with depth. A Monte-Carlo method is applied to collided gamma-rays. It is concluded from the results of the calculations that the flux density and exposure rate are strongly affected by the escape-to-production ratio and diffusion coefficient of 222Rn in the soil. These calculations are applied to natural radionuclides in the soil of the campus of Nagoya University. It is shown that the difference between the total exposure rate on the campus calculated by assuming exponential distribution of 222Rn in the soil and that by assuming uniform distribution ranges from 3 to 8%.
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