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Radiation Protection Dosimetry 55:257-263 (1994)
© 1994 Oxford University Press

Age-Dependant Effective Doses for Neutrons from Thermal to 18.3 MeV

Y. Yamaguchi

Effective doses, E, for neutrons have been calculated using the Monte Carlo method and a series of age-specific phantoms: 0, 1, 5, 10 and 15 years, and adult. Sixteen incident energies from thermal to 18.3 MeV were selected for each of five irradiation geometries: AP, PA, RLAT, ROT, ISO. The continuous function of the radiation weighting factors wR and the tissue weighting factors wT, proposed in ICRP Publication 60, were used in the dose calculation. The results are tabulated in the form of age-dependent conversion factors correlating the incident neutron fluence with the effective dose. A significant age dependence of E was found: whereas the older body receives the higher E for energies below about 100 keV, above this energy the opposite was observed. The lack of conservatism of H*(10), the ambient dose equivalent computed with the new Q-L relationship, against E was found for the AP, PA and ROT geometries for younger age groups.


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