Study of the phototransferred thermoluminescence in KC1:Eu2+ phosphors

M. Pedroza-Montero, R. Meendrez, V. Chernov, M. Barboza-Flores, B. Cataneda, Y. S. Horowitz, L. Oster

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The phototransferred thermoluminescence (PTTL) processes play an important role in the optical stimulated luminescence (OSL) and thermoluminescence (TL) dosimetric properties in KCl:Eu2+ crystals. In the present work, experimental evidence is presented about the participation of F and Fz centres in the associated recombination luminescence mechanisms involved with all three phenomena. An analysis of the TL glow curve of KCl:Eu2+ exposed to X ray ionising radiation shows three main thermoluminescence peaks around 370, 390 and 470 K. The 470 K highest intensity peak, considered the dosimetric peak due to its low fading and linear dose behaviour, is strongly correlated to the F and Fz centres. Through optical absorption spectra measuréments of an optically bleached specimen, it was found that a minimum occurs at 560 nm, coinciding with the F centre band in KCl:Eu2+. Moreover, the diminishing of the integrated TL 470 K peak intensity is also seen to have a minimum at 560 nm (F centres); it also happens simultaneously with an increase of the integrated TL peak associated to the Fz band. This supports the close relation of the F and Fz centres in the PTTL process in KCl:Eu2+.

Original languageEnglish
Pages (from-to)183-185
Number of pages3
JournalRadiation Protection Dosimetry
Volume100
Issue number1-4
DOIs
StatePublished - 1 Jan 2002
Externally publishedYes

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