Abstract
A 25 × 25 cm 2 NaI gamma spectrometer with a plastiv anticoincidence shield has been constructed with particular regard to minimizing neutron-associated backgrounds. The spectrometer is used with the Lawrence Livermore Laboratory cyclograaff accelerator. The unique feature of the spectrometer is the use of thick shields of 6LiH completely surrounding both the central NaI crystal and the anticoincedence plastic. It is found that under normal conditions the count-rate limitation of the spectrometer is due to gammas in the central crystal emitted from accelerator target, and not to neutron-induced events.
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