AN ASSESSMENT OF THE FEASIBILITY OF USING MONTE-CARLO CALCULATIONS TOMODEL A COMBINED NEUTRON GAMMA ELECTRONIC PERSONAL DOSIMETER/

A Monte Carlo facility has been developed for modelling the response o f semiconductor devices to mixed neutron-photon fields. This utilises the code MCNP for neutron and photon transport and a new code, STRUGGL E, which has been developed to model the secondary charged particle tr ansport. It is thus possible to predict the pulse height distribution expected from prototype electronic personal detectors, given the detec tor efficiency factor. Initial calculations have been performed on a s imple passivated implanted planar silicon detector. This device has al so been irradiated in neutron, gamma and X ray fields to verify the ac curacy of the predictions. Good agreement was found between experiment and calculation.