Development of phoswich detectors for simultaneous counting of alpha particles and other radiations (emitted from Actinides)

In order to develop actinide monitors, simultaneous counting of α particles and other radiations has been investigated by means of phoswich detectors. Typical phoswiches devised up to the present consist of the following: ZnS(Ag)/NE102A for α and β(γ) counting, ZnS(Ag)/NaI (Tl) or YAP for α and β(γ) counting, ZnS(Ag)/anthracene/6Li glass for α, β(γ), thermal- and fast-neutron counting, etc. Optical filters could be applied to some of such phoswiches for adjustment of pulse height and/or pulse shape. An attempt to directly detect enriched uranium solution for actinide flow monitoring and proposed future developments are also described.