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Radio- and thermoluminescence of single-doped and codoped lithium-sodium sulfate

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Radioluminescence at room temperature and thermoluminescence (TL) measurements of single-doped and codoped LiNaSO4 above room temperature are reported here. The codoped samples were studied to investigate the possibility of enhancing the TL sensitivity of LiNaSO4:Eu. This objective was not satisfied and the codopants (Ce, Sm, Ho and Er) decrease the TL sensitivity and slightly shift the dosimetric peak to lower temperatures. Samples doped with Mg, K, Bi and Tl were used with the hope that they may alter the trapping centers stability and introduce new peaks in the temperature range 430-500K to observe any TL discontinuity or wavelength shift in their spectra as observed in CL measurements. This objective was fulfilled with Tl and Bi, where there is a discontinuity and/or wavelength shift at about 460K. Such intensity and/or wavelength variations are ascribed to microstructural phase changes within the LiNaSO4 crystals that may result from twin boundaries behaving like Na2SO4.



Original languageEnglish
Pages (from-to)1030-1037
Number of pages8
JournalRadiation Effects and Defects in Solids
Issue number11-12
Publication statusPublished - 1 Dec 2013

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