释光断代相关矿物样品的三维热释光谱

Three-dimensional Thermoluminescence Spectra of Mineral Samples in TL and OSL Dating

天然矿石的释光常应用于地质年代测定。选择几种有代表性的天然矿石,如石英、钾长石、钠长石和莫来石等样品,测定了三维热释光谱图。实验观察到石英样品发光波长位于350 nm到600 nm范围,发光主要是低温峰,其中江西广丰的石英样品发光较弱,而甘肃崆峒山的石英样品的发光较强,显示矿石的发光特性与样品来源相关。长石样品的热释光发光峰组成复杂,从300 nm到750 nm范围均有发光,且具有明显的高温发光峰。实验结果也显示出钠长石和钾长石样品具有不同的发光特征。石英和长石的发光波长均较宽,且覆盖检测滤光片的波长范围,因此对测年结果产生较大的影响,而莫来石样品的发光强度较弱,且主要发光波长大于600nm,其发光对年代测定影响较小。

TL （thermoluminescence） and OSL （ optical stimulated luminescence） of mineral samples are often used to geological dating. The 3 D thermoluminescence spectra of several kinds of mineral, such as quarts, potassium feldspar, sodium feldspar and mullite were measured. For the samples of quartz, the wavelengths are ranged from 350 nm to 600 nm, and mainly low temperature glow peaks are observed. The results show that luminescence intensity of quartz from Jiangxi is weaker than that from Gansu, it means that the luminescence characteristics depend on the sample region. The TL peaks of feldspar are rather complex, the wavelength is ranged from 300 nm to 750 nm, and the high temperature peaks are observed. The wavelengths of quartz and feldspar are rather broad and cover the detectable scope of the optical filter, hence quartz and feldspar can contribute more thermoluminescence in geological dating than that of mullite.