US-UK Cooperative Research: Studies of Thermoluminescence and Catholuminescence

该奖项将支持俄克拉荷马州立大学的S.W.McKeever博士和英国苏塞克斯大学的P.D.Townsend博士之间的合作研究。麦基弗博士将在汤森博士的实验室里工作六个月，从事三个不同的项目：1)II-VI半导体的导电性和阴极发光，2)掺杂氟化锂的吸收和发光，3)石英的热释光(TL)。在此期间，McKeever博士将广泛使用设备来记录3D热释光发光曲线和阴极发光。特别是3D TL设备是独一无二的，在McKeever博士的家乡机构是不能使用的。将要研究的材料是碲化镉、氟化锂和二氧化硅。这些材料中的每一种都具有重大的技术重要性。在CdTe的工作中，研究人员将检查低温阴极发光过程中的边缘发射，以研究束缚激子弛豫发光。其目的是表征不同样品中的激子态，并利用这些信息来研究材料的非线性光学性质。“3D”热释光装置将用于氟化锂的研究。氟化锂样品中掺杂了不同程度的铜、镁和磷杂质。研究人员将寻找由于晶格内的杂质聚集效应而在发射中产生微扰的证据。这些性能将用于评估用于剂量测定应用的氟化锂：铜、镁和钛的最佳杂质浓度和生产方法。二氧化硅的工作将涉及阴极发光和3D热释光测量，以研究各种热、辐射和电解扫描处理对发光性能的影响，以便更清楚地了解这种材料的热释光行为。McKeever博士在热释光及其在剂量测定和天然沉积物测年中的应用方面在国际上是知名的。

This award will support collaborative research between Dr. S. W. McKeever, Oklahoma State University and Dr. P. D. Townsend, University of Sussex, England. Dr. McKeever will spend six months in Dr. Townsend's laboratory, working on three distinct projects: 1) conductivity and cathodoluminescence of II-VI semiconductors, 2) absorption and luminescence of doped lithium fluoride and 3) the thermoluminescence (TL) of quartz. During this period, Dr. McKeever will make extensive use of apparatus for the recording of 3D TL glow-curves and of cathodoluminescence. The 3D TL facilities in particular are unique and not available at Dr. McKeever's home institution. The materials which will be studied are cadmium telluride, lithium fluoride and silicon dioxide. Each of these materials has significant technological importance. In the CdTe work, the investigators will examine edge emission during low temperature cathodoluminescence in order to study bound exciton relaxation luminescence. The purpose is to characterize the excitonic states in different samples and to use this information in the study of the non-linear optical properties of the material. The '3D' TL apparatus will be used for the lithium fluoride studies. The lithium fluoride samples are variously doped with copper, magnesium, and phosphorus impurities. The investigators will look for evidence of perturbations in the emission due to impurity clustering effects within the lattice. These properties are to be used in assessing the optimal impurity concentrations and method of production of lithium fluoride: copper, magnesium, and titanium for dosimetry applications. The silicon dioxide work will involve cathodoluminescence and 3D TL measurements to examine the effects on the luminescence properties of various thermal, radiation and electrolitic sweeping treatments in order to more clearly understand the TL behavior of this material. Dr. McKeever is internationally well known in the field of thermoluminescence and its application in dosimetry and in dating of natural sediments.