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KMID : 0364919990240040205
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Journal of Radiation Protection and Research
1999 Volume.24 No. 4 p.205 ~ p.213
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Assessment of Effective Doses in The Radiation Field of Contaminated Ground Surface by Monte Carlo Simulation
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Abstract
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Effective dose conversion coefficients from unit activity radio nuclides contaminated on the ground surface were calculated by using MCNP4A code and male/female anthropomorphic phantoms. The simulation calculations were made for 19 energy points in the range of 40 keV to 10 MeV. The effective doses E resulting from unit source intensity for different energy were compared to the effective dose equivalent HE of previous studies. Our E values are lower by 30% at low energy than the H_(E) values given in the Federal Guidance Report of USEPA. The effective dose response functions derived by polynomial fitting of the energy-effective dose relationship are as follows:
f(ε)[fSv ㎡) = 0.0634 + 0.727ε - 0.0520ε² + 0.00247ε³, where ε is the gamma energy in MeV.
Using the response function and the radionuclide decay data given in ICRP 38, the effective dose conversion coefficients for unit activity contamination on the ground surface were calculated with addition of the skin dose contribution of beta particles determined by use of the DOSEFACTOR code. The conversion coefficients for 90 important radionuclide were evaluated and tabulated. Comparison with the existing data showed that a significant underestimates could be resulted when the old conversion coefficients were used, especially for the nuclides emitting low energy photons or high energy beta particles.
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