Decay Properties of ZnS(Ag) Phosphors

概要

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The fact that a phosphor exhibits different decay times for different kinds of exciting radiation has recently been reported. This is expected to be found also in ZnS(Ag) phosphor which is often applied in photonuclear experiment. Detailed measurements of such decay properties has been carried out in the present work. It came out clear that the phosphor has two types of decay mode for a kind of radiation, one being exponential and another hyperbolic with time, and that the phosphor has different decay constants in the exponential form decay for different kinds of radiation. The decay constants were obtained to be 100mμsec and 10mμsec for the α-particle and γ-ray excitation, respectively. Thus, contrary to a previous work by Koontz et al.^<10>), an apparent difference was observed for these two kinds of excitation. Furthermore, it was observed that in the case of γ-ray excitation the decay is mainly exponential and in the case of α-particle excitation mainly hyperbolic. The difference of decay modes and the difference of the decay constants make it possible to discriminate protons or α-particles from the strong γ-ray background.
社団法人日本物理学会の論文
1959-12-05