The reasons the scintillation efficiency decrease of CsI(Tl) crystals exposed by the high-dosed radiation

L. Trefilova, B. Grinyov, V. Alekseev, I. Golub, V. Yakovlev, A. Meleshko

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Abstract

The role of radiation defects in the light yield degradation of CsI(Tl) scintillation detectors has been investigated. The spectra and decay kinetic study of the luminescence of CsI(Tl) crystals coloured by γ-radiation (60Co, 106 Gy) allowed to conclude that two types of the centres induced by irradiation absorb the luminescence of Tl+ centres responsible for the scintillations. The reabsorption of the Tl+ emission leads to the appearance of the long-wavelength luminescence caused by the colour centres of the first type. The luminescence of the centres of the second type is quenched at room temperature. These centres are not only deteriorating the efficiency of the activator luminescence, but also functioning as quenching centres to which the non-radiative energy transfer from Tl+ centres is realized.

Original languageEnglish
Pages (from-to)839-842
Number of pages4
JournalRadiation Measurements
Volume42
Issue number4-5
DOIs
Publication statusPublished - Apr 2007

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Keywords

  • CsI(Tl) crystal
  • Energy transfer
  • Irradiation
  • Quenching centre

ASJC Scopus subject areas

  • Radiation

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