A COMBINED USE OF THE BD-PND AND BDT BUBBLE DETECTORS IN NEUTRON DOSIMETERY

The BDT bubble detector is predominantly sensitive to thermal neutrons and the BD-PND bubble detector is only sensitive to neutrons with ene rgies larger than about 50 keV. The response of both types of bubble d etectors was measured for four radionuclide sources, for thermal neutr ons and for several mono-energetic neutron beams. At the same time the sensitivity given by the manufacturer was checked. Combining the two measured sensitivity functions with adequate weighing factors provides a better neutron dose equivalent response for the entire energy range . The effect of the new ICRP conversion factors (ICRP, 1996) following the ICRP 60 recommendations (ICRP, 1990) is determined. (C) 1998 Else vier Science Ltd. All rights reserved.