Photoluminescence and thermoluminescence in BaSO4:Eu is reported. In earlier works, divalent Eu has been studied in BaSO4. In the present work Eu was incorporated as in predominantly Eu3+ or Eu2+ form. It is shown that RE3+ ↔ RE2+ conversion or RE2+ ↔ RE+ conversion is not an integral part of gamma induced TL. Eu3+ ↔ Eu2+ conversion, on the other hand, may be important in UV induced TL. Low UV efficiency of this material is attributed to poor Eu3+ ↔ Eu2+ conversion. This is in quite contrast to the analogus material CaSO4: Eu.
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Atone et al. (1993) studied this question.
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