In recent years silicon detectors have nearly replaced Geiger-Muller tubes in personal dosemeters for gamma and X- rays. Several tentatives have been undertaken to extend these dosemeters to fast neutrons, but problems arose since in the generally present mixed fields it appeared difficult to separate the effect of both kind of radiations. In this paper, a method for fast neutron monitoring is investigated. It results from a computer simulation analysis of fast neutrons and gamma-ray interactions in silicon detectors. For neutron energies between 0.75 and 15 MeV, it proposes a real time personal dosemeter, with a response accuracy better than 30% in a mixed neutron and gamma-ray field.
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