SEARCH FOR THE DOSE-SENSITIVE OPTICALLY STIMULATED LUMINESCENCE RESPONSE IN NATURAL CARBONATES

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI:10.3176/geol.2001.3.01

Ivar Jaek, Galina Hütt, Ilmar Rammo, V. Vasilchenko

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引用次数: 1

Abstract

Carbonates of different origin, such as Iceland spar, calcites, and mollusc shells, used as electron spin resonance and thermoluminescence palaeodosimeters, were studied in order to determine their suitability for optically stimulated luminescence dating. The stimulation/excitation spectra of the afterglow of the samples were recorded in the wavelength range of 250 -1100 nm. The results of the study show that these spectra present either excitation spectra of Mn 2+ ion fluorescence (samples of calcites and Iceland spar, red emission recorded) or the excitation spectra of primary phosphorescence (samples of carbonates, including mollusc shells; short-wave emission bands recorded). The recorded stimulation spectra revealed no spectral bands sensitive to stimulation by ionizing radiation, which would disappear as a result of heating and could thus be related to deep traps in carbonates, needed in dating. The causes of this situation which is unusual in luminescent crystals, including luminescence (palaeo)dosimeters, and the ways of overcoming the difficulties in optical dating of natural carbonates are discussed.

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在天然碳酸盐中寻找剂量敏感的光刺激发光响应

研究了不同来源的碳酸盐，如冰岛石、方解石和软体动物壳，作为电子自旋共振和热释光古剂量计，以确定它们在光激发光测年中的适用性。记录了样品余辉在250 ~ 1100 nm波长范围内的激发/激发光谱。研究结果表明，这些光谱要么是Mn 2+离子荧光的激发光谱(方解石和冰洲石样品，记录了红色发射)，要么是初级磷光的激发光谱(碳酸盐样品，包括软体动物壳;短波发射波段记录)。记录的刺激光谱显示，没有对电离辐射刺激敏感的光谱带，这些光谱带会因加热而消失，因此可能与测年所需的碳酸盐深层圈闭有关。讨论了这种在发光晶体中不常见的现象的原因，包括发光(古)剂量计，以及克服天然碳酸盐光学测年困难的方法。

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Proceedings of the Estonian Academy of Sciences. Geology

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