Abstract
The thermal neutron detection properties of Cs/sub 2/LiYCl/sub 6/:0.1%Ce/sup 3+/ and Cs/sub 2/LiYBr/sub 6/:1%Ce/sup 3+/ single crystals are presented. The compounds show high scintillation photon yields of 70 000 and 88 200 photons emitted per absorbed thermal neutron, respectively. Events caused by primary electrons with energy below 2.9 and 3.4 MeV, respectively, can be separated from neutron-induced events by pulse-height discrimination. For Cs/sub 2/LiYCl/sub 6/:0.1Ce/sup 3+/, due to the presence of a 4-ns fast core-valence luminescence, thermal neutrons and gamma rays can also be discriminated by means of the shape of the scintillation pulse. The main part of the scintillation pulse in Cs/sub 2/LiYCl/sub 6/:0.1%Ce/sup 3+/ is relatively slow, however, Cs/sub 2/LiYBr/sub 6/:1%Ce/sup 3+/ has a relatively intense component with /spl tau/=85;ns decay time.
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