Understanding the reasons of variations in luminescence sensitivity of natural Quartz using spectroscopic and chemical studies
Abstract
Natural quartz from diverse provenances exhibit variations in their luminescence sensitivity (photon flux/mg·Gy) that span over ten orders of magnitude. A range of factors (such as crystallization/recrystallization process, irradiation, thermal and optical history) that lead to varied luminescence sensitivity have been attributed to such differences but a clearly definable/identifiable reason is still awaited; which could be translated in to the identification of commonly occurring luminescence quenchers/ enhancers that may be found in natural quartz samples. Towards this, quartz mineral grain separates from different provenances and varied depositional environments were examined spectroscopically using Fourier Transform infra-red spectroscopy (FTIR), optically stimulated luminescence (OSL), photoluminescence (PL), time resolved PL (TRPL) decay, thermoluminescence (TL) and the trace element analysis. Through the present study, an anti correlation emerges between OSL sensitivity and water content in quartz (estimated through integrated intensity of normalized FTIR signal in the wavenumber region 3000-3600 cm-1), such that a sensitivity change of over 5 orders of magnitude corresponded to a change in integrated water absorption signal by 5 times, but in opposite direction. PL and TRPL results enabled further insights.
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