High spatial resolution scintillation detector based on the H8500 photomultiplier

The Flat-Panel photomultiplier (Hamamatsu H8500) can be utilized as a high resolution area detector for thermal neutrons and high energy gamma rays. This detector type is useful for special neutron scattering experiments and for the PET applied to small animals. In various test measurements this will be demonstrated by coupling suitable scintillators (NaI, BGO, LiI single crystals, /sup 6/Li-glass, and LiGd-Borate) to the photocathode and by feeding the 64 output signals of the photomultiplier (PM) into an active resistor network. The four output signals from the network are transferred to the pulse processing board (UniDAQ) where the event position address is calculated and where the event storage is done by memory increment.