REFERENCE FLUENCE-TO-DOSE-EQUIVALENT CONVERSION COEFFICIENTS AND ANGULAR-DEPENDENCE FACTORS FOR 4-ELEMENT ICRU TISSUE, WATER AND PMMA SLAB PHANTOMS IRRADIATED BY BROAD ELECTRON-BEAMS

In order to support a Joint ICRP/ICRU Task Group action aiming at the collection of data of interest in the field of radiation protection, t he EURADOS Working Group 4 'Numerical Dosimetry' has initiated a compu tational programme for the determination of fluence-to-absorbed-dose o r dose-equivalent conversion coefficients for slab phantoms irradiated by external electrons of normal and oblique incidence, Seven experts in electron transport simulations agreed to contribute to the project. Using different code systems, they provided new data in the energy ra nge between 60 keV and 10 MeV for three slab phantoms consisting of 4- element ICRU tissue, water and PMMA, at depths of 0.007 g.cm(-2), 0.3 g.cm(-2) and 1.0 g.cm(-2). From those data, reference conversion coeff icients were derived for each depth. This paper summarises the main fe atures of the detailed data analysis subsequently performed on the dif ferent sets of numerical values, and extensively described in PTB Repo rt Dos-24.