Concentration Dependence of Afterglow Suppression in CsI:Tl,Sm
نویسندگان
چکیده
Abstract. Combined radioluminescence, afterglow and thermoluminescence experiments on single-crystal samples of co-doped CsI:Tl,Sm suggest that deeper samarium electron traps scavenge electrons from shallower thallium traps and that electrons subsequently released by samarium recombine non-radiatively with holes trapped as VKA(Tl ) centers, thus providing a mechanism for suppression of trapped-charge accumulation in repetitive applications. In the present investigation, experiments performed on two single-crystal samples of CsI:Tl,Sm with nominal concentrations of 0.11% Tl and of 0.2% and 0.05% Sm, respectively, support the inference that electrons tunnel freely between samarium ions and are trapped preferentially near VKA(Tl ) centers where non-radiative recombination is the rate-limiting step.
منابع مشابه
A Tunneling Model for Afterglow Suppression in CsI:Tl,Sm Scintillation Materials.
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 tunne...
متن کاملScintillation, Afterglow and Thermoluminescence of CsI:Tl,Sm
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 VKA(Tl + )...
متن کاملconferenceseries.iop.org materials science and engineering open access proceedings IOP Conferences Series: Materials Science and Engineering
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 VKA(Tl) cent...
متن کاملMultiple thermoluminescence glow peaks and afterglow suppression in CsI:Tl co-doped with Eu or Yb
CsI:Tl is a widely utilized scintillator material with many desirable properties but its applicability is limited by persistent afterglow. However, effective afterglow suppression has been achieved by co-doping with divalent lanthanides. The present report is concerned with observation of multiple thermoluminescence glow peaks in CsI:Tl,Eu and CsI:Tl,Yb, attributed to varying distributions of c...
متن کاملSuppression of afterglow in CsI:Tl by codoping with Eu—II: Theoretical model
The mechanism for afterglow suppression in codoped CsI:Tl,Eu reported in the preceding paper was investigated by combined radioluminescence and thermoluminescence experiments. Model rate equations informed by these experiments were employed to simulate afterglow. It was found that codoping with europium introduces deep electron traps, with room-temperature glow peaks, that effectively scavenge ...
متن کامل