Abstract
A total absorption gamma-ray spectrometer has been developed using one large NaI(Tl) crystal (24 cm × 24 cm) surrounded by a plastic scintillator operated in anticoincidence. An energy resolution of 3.6% with a detection efficiency of 24% is achieved for 22 MeV gamma rays. The use of fast electronics for both scintillators makes efficient pileup suppression possible with negligible deadtime even in the presence of high background. The effects produced by changing the collimation of the gamma rays and the detection level of the anticoincidence pulses are investigated.
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