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Report No.

Utilisation of OSL from table salt in retrospective dosimetry

Fujita, Hiroki; Jain, M.*; Murray, A. S.*

Common salt has been previously suggested for use in dose estimation in accident dosimetry. In this study the optically stimulated luminescence (OSL) and the thermoluminescence (TL) characteristics of Ajishio are studied. A comparison of OSL and TL signals allows identification of common source traps. The initial OSL signal contains a dominant thermally unstable component, which necessitates a prior heat treatment. Based on these luminescence characteristics, a single - aliquot regenerative - dose (SAR) protocol is developed and tested. Using this OSL SAR protocol with blue-LED stimulation, a known given dose was measured to within one standard error in 6 out of 10 samples of different Japanese commercial salts. A minimum detection limit of 15 mGy was estimated using the OSL protocol. It is concluded that the OSL from Japanese commercial salts could almost be used successfully to derive precise estimates of accident dose.



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