Optical properties and radiation response of Li ion-doped CsI scintillator crystal
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2019
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RAP Conference Proceedings
Resumo
Scintillators are materials that convert the energy of ionizing radiation into a flash of light. Due to the
existence of different types of scintillators, they are classified into three groups according to their physicochemical
characteristics, namely, inorganic, organic and gaseous scintillators. Among the inorganic crystals, the most
frequently used as scintillator consist of alkali metals, in particular alkaline iodides. Scintillation materials have
many applications, for instance in medical imaging, security, physics, biology, non-destructive inspection and
medicine. In this study, lithium doped CsI scintillator crystals were grown using the vertical Bridgman technique. The
concentration of the lithium doping element (Li) studied was 10-4 M to 10-1 M. Analyses were carried out to evaluate
the developed scintillators with regard to luminescence emission and optical transmittance. The luminescence
emission spectra of these crystals were measured with a monochromator for gamma radiation from 137Cs source
excitation. The determination of the dopant distribution along the crystalline axis allowed the identification of the
region with Li concentration uniformity, which is the region of the crystalline volume indicated for use as a radiation
detector. The crystals were excited with neutron radiation from AmBe source, with the energy range of 1 MeV to 12
MeV. As neutron sources also generate gamma radiation, which can interfere with the measurement, it is necessary
that the detector be able to discriminate the presence of such radiation. Accordingly, experiments were performed
using gamma radiation in the energy range of 59 keV to 1333 keV in order to verify the ability of the detector to
discriminate the presence of different types of radiation.
Como referenciar
PEREIRA, MARIA da C.C.; MADI FILHO, TUFIC; BERRETTA, JOSE R.; TOMAZ, LUCAS F.; MADI, MIRIAM N. Optical properties and radiation response of Li ion-doped CsI scintillator crystal. RAP Conference Proceedings, v. 4, p. 131-135, 2019. DOI: 10.37392/RapProc.2019.26. Disponível em: http://repositorio.ipen.br/handle/123456789/31060. Acesso em: 28 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.