A YAP scintillator (YAlO3: Ce crystal) for alpha counting has been produced
in powder form and this paper describes its performance characteristics. B
y measuring pulse-height and rise-time distributions, it was found that the
YAP powder, as a fast detector for alpha rays, could clearly distinguish a
lpha events from beta and gamma events. In addition, the YAP powder was use
d in a phoswich detector combined with a YAG (Y3Al5O12: Ce) crystal for bet
a and gamma detection. (C) 2000 Elsevier Science Ltd. All rights reserved.