ORGAN DOSES AND DOSE EQUIVALENTS FOR NEUTRONS ABOVE 20 MEV

MCNP Monte Carlo calculations with an extended cross section data set have been performed for an anthropomorphic MIRD (ADAM) phantom in the neutron energy range between 20 and 100 MeV. The irradiation condition s vary from 0 degrees (frontal incidence) up to 75 degrees to the left side of the MIRD phantom. From the fluence calculations, organ doses and dose equivalents are derived using the kerma approximation. The qu ality factor as function of neutron energy for the calculation of effe ctive dose equivalent, H-E, is derived from initial charged particle s pectra produced in an ICRU tissue element by primary neutrons. Above 2 0 MeV an approximation was applied. Resulting organ doses and dose equ ivalents are compared with a data set published by Nabelssi and Hertel (1993).