Role of Activator and Vacancy Centers in the Decay of the Gamma Scintillators of CsI—Na Crystals

Panova, A.N.; Grinev, B.V.; Lavrent'ev, F.F.; Soifer, L.M.; Shakhova, K.V.; Kosinov, N.N.; Mitichkin, A.I.; Korsunova, S.P.
July 2004
Journal of Applied Spectroscopy;Jul/Aug2004, Vol. 71 Issue 4, p546
Academic Journal
The influence of the concentration of an activator (CNaI) and of plastic deformation on a change in the contribution of a slow component to the decay of the γ‐scintillations of CsI–Na crystals was investigated, as well as the influence of CNaI on a change in the shape of the luminescence excitation spectrum in the region of absorption of activator centers (AC) and of vacancy‐related centers (VRC) and also on a change in the intercenter time of deexcitation of the centers indicated. It is shown that AC and VRC participate in the photoluminescence and γ‐scintillations of CsI–Na crystals. In the γ‐scintillations, AC are responsible for the component τ1 = 370 nsec, whereas the components τ1′ = 460 nsec and τ2 ∼ 2 μsec are associated with VRC. The reduction of τ1 from 770 to 560 nsec with an increase in CNaI from 2·10-3 to 3·10-2 mole% and from 570 to 470 nsec after plastic deformation of the crystals (ℇ = 5%) along the <111> axis is caused by a decrease in the number of VRC. The mechanisms underlying the γ‐scintillations of the CaI–Na crystals containing AC and VRC and also the decrease in the number of VRC are discussed.


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