A Tunneling Model for Afterglow Suppression in CsI:Tl,Sm Scintillation Materials |
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| Authors: | Kappers L A Bartram R H Hamilton D S Lempicki A Brecher C Gaysinskiy V Ovechkina E E Thacker S Nagarkar V V |
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| Affiliation: | Department of Physics, University of Connecticut, Storrs, CT 06269-3046, USA. |
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| Abstract: | Combined radioluminescence, afterglow and thermoluminescence experiments on single-crystal samples of co-doped CsI:Tl,Sm suggest that samarium electron traps scavenge electrons from thallium traps and that electrons subsequently released by samarium recombine non-radiatively with trapped holes, thus suppressing afterglow. Experiments on single crystals support the inference that electrons tunnel freely between samarium ions and are trapped preferentially as substitutional Sm+ near VKA(Tl+) centers where non-radiative recombination is the rate-limiting step. Afterglow in microcolumnar films of CsI:Tl,Sm is enhanced by inhomogeneities which impede tunneling between samarium ions, but is partly suppressed by annealing. |
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