Abstract
Despite its shortcomings and inconsistencies such as using the kerma approximation, the ICRU tissue, which does not really exist and the radiation quality factor Q defined in water, the personal dose equivalent Hp defined in the 1980s remains until now the operational quantity used to assess the effective dose E for external exposure. To help overcome most of these shortcomings and inconsistencies a new operational quantity Hp(30)water to replace Hp(10) is proposed. Fluence-to Hp(30) water conversion coefficients are calculated for photon energies from 0.02 to 10 MeV using the Monte Carlo transport code EGSnrc. Calculations are performed in a water cube phantom using full transport of secondary charged particles. The comparison of the conversion coefficients of Hp(30) and E shows that Hp(30) water can represent a good envelope of E over the whole energy range considered.
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