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Scintillation, Afterglow and Thermoluminescence of CsI:Tl,Sm

Author:
Kappers, L A   Bartram, R H   Hamilton, D S   Lempicki, A   Brecher, C   Gaysinskiy, V   Ovechkina, E E   Nagarkar, V V   


Journal:
IOP Conference Series: Materials Science and Engineering


Issue Date:
2010


Abstract(summary):

Experiments on 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. These experiments support the inference that electrons tunnel freely between samarium ions and are trapped preferentially as substitutional Sm + near V KA (Tl +) centers where non-radiative recombination is the rate-limiting step. Combined radioluminescence, afterglow and thermoluminescence on single-crystal samples of CsI:Tl and CsI:Tl,Sm, recorded sequentially at adjusted gain settings following low-temperature irradiation, reveal reversible radiation damage as well.


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