ON THE CONSERVATIVITY OF H-P(10)

For neutrons, numerical values for the Personal Dose Equivalent, H-p(1 0,alpha)/Phi, in the ICRU TE slab phantom were recently recommended in an international standard (IEC-1323, 1995) and are intended for calib rating individual dosemeters fixed to the front of the phantom, with r espect to energy and angle of incidence. These recommended conversion factors are compared with the present MCNP calculations of conversion coefficients h(p Phi)(10;E,alpha), and with calculations of Effective Dose, E (ICRP 60), and Effective Dose Equivalent, H-E (ICRP 26), in th e anthropomorphic ADAM phantom for monoenergetic and parallel neutron radiation (expanded field) with an angle of incidence varying from 0 d egrees (A-P) up to 75 degrees to the left side of the phantom in the e nergy range from thermal up to 19 MeV. For the calculation of the conv ersion coefficients h(p Phi)(10;E,alpha) and the Effective Dose Equiva lent, H-E, in the phantom, a quality factor is applied which takes int o account the revised Q(L) relationship of ICRP 60 and the new stoppin g power data for protons and alpha particles of ICRU Publication 49 (1 993). For the calculation of Effective Dose, E, the smooth radiation w eighting factor w(R) of ICRP 60 is used.