光释光信号灵敏度变化的模式、验证和推论  

Sendtivity change of IRSL signal: model, predictions and tests

作　　者：李盛华[1] 

机构地区：[1]香港大学放射同位素研究所

出　　处：《核技术》1995年第8期458-462,共5页Nuclear Techniques

摘　　要：根据势阱电子对太阳光的灵敏程度，将可被太阳光晒退的势阱分为“易晒”和“难晒”两种类型，从而提出了一个红外光释光信号灵敏度变化的理论模式．模式认为在电离辐照中，这两类势阱竞争所产生的电子，光释光信号的灵敏度反映了“易晒”势阱中的电子对辐照剂量的响应。灵敏度与“难晒”势阱中的电子浓度有关．光释光信号的灵敏度在实验室晒退后升高或降低不仅与实验室晒退的条件和标本的年龄有关，而且与标本在沉积前的曝光有关．此模式可以解释现有文献中有关光释光灵敏度变化的现象和结果，并用实验对该模式做了进一步的验证．最后，对具体沉积物的灵敏度变化进行了讨论．A model is introduced for explaining the sensitivity change of the infrared stimulated luminescenceonSL) signal used for dating. The model involves the competitions of the two types of traps to captive the electrons creaked in the irradiation process, the sensitivity of the IRSL signal representS the resPOnse of the T, signal charges in the“easy to bleach”trap to the irradiation dose and depends on the concentration of election in the u hard tO bleach“ traps. It predicts that the sensitivity of the IRSL signal can be increased, decreased or unchanged aller laboratory bleaching. The sensitivity change is dependent. on the degree of sunlight bleaching prior to deposition, the age of the sample and the conditions of laboratory bleach. The predictions by the model agree well with resultS reported in the literature. Further more, the model has been tested with a specially designed experiment. The applications to optical dating with regeneration method are discussed.

关 键 词：光释光 信号再生法 灵敏度 变化 年代 测定 

分 类 号：P597.1[天文地球—地球化学]