The Scintillation Process of NaI (Tl)

概要

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The scintillation process of NaI(Tl) crystal was studied, and explained according to the model of Hadley et al. The scintillation pulse above room temperature could be expressed by the solution of rate equations for Tl^0, excited Tl^+, Tl^<++> centers and conduction electrons, assuming the decay time of the V_k center to be negligible. From the temperature dependence of the decay time, the energy difference between the energy level of Tl^0 center and the bottom of the conduction band was obtained to be 0.29 eV, which almost coincided with the value estimated from the thermal glow curve after UV or X ray irradiation. However, the pulse shape below room temperature could not be explained satisfactorily. Therefore another process, i.e. contribution from the self-trapped exciton or the perturbed exciton, had to be introduced.
社団法人応用物理学会の論文
1975-01-05