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Nonlinear dose dependence and dose-rate dependence of optically stimulated luminescence and thermoluminescence

机译：光学激发和热致发光的非线性剂量依赖性和剂量率依赖性

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摘要

When thermoluminescence (TL) and optically stimulated luminescence (OSL) are utilized for dosimetry and for dating of archaeological and geological samples, one hopes that the dependence of the measured signal on the dose is linear, and that no dose-rate effects occur. In TL measurements, however, several cases of superlinear dose dependence have been reported and also some dose-rate effects have been found. It has been shown theoretically that such superlinearity can result from a simple model of trapping states and recombination centers, provided that a disconnected competing trap or center is involved. Similar circumstances were shown to cause a dose-rate dependence of the measured TL. More recently, some results of OSL superlinearity have been reported. The present work provides a theoretical account of this effect. A distinction is made between OSL due to relatively short pulses of stimulating light and the integral over a long illumination. It is shown that in the former, one can expect a quadratic dose dependence of the effect provided one starts with empty trapping states and recombination centers. In the latter, superlinearity can be found only in the presence of competitors, in a similar way to the TL behavior. Also, the possibility of dose-rate dependence of OSL, which has not been reported in the literature is predicted and should be checked in future OSL measurements. (C) 2001 Elsevier Science Ltd. All rights reserved. [References: 23]
机译：当使用热致发光（TL）和光学激发发光（OSL）进行剂量测定以及对考古和地质样品进行测年时，人们希望被测信号对剂量的依赖性是线性的，并且不会出现剂量率效应。然而，在TL测量中，已经报道了几种超线性剂量依赖性的情况，并且还发现了一些剂量率效应。从理论上已经证明，只要涉及到一个断开的竞争阱或中心，这种超线性可以由一个简单的阱状态和重组中心模型产生。结果表明，类似情况会导致所测TL的剂量率依赖性。最近，已经报道了OSL超线性的一些结果。目前的工作提供了这种效果的理论解释。由于刺激光的脉冲相对较短，OSL与长时间照明的积分之间存在区别。结果表明，在前者中，如果以空的俘获态和重组中心开始，则可以预期效果的二次剂量依赖性。在后者中，只有在存在竞争者的情况下才能发现超线性，这与TL行为类似。而且，预测了OSL剂量率依赖性的可能性，这在文献中尚未报道，应在以后的OSL测量中进行检查。 （C）2001 Elsevier ScienceLtd。保留所有权利。 [参考：23]

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