Thermal activation and radiation quenching characteristics and their application to the pre-dose dating of porcelain

The pre-dose technique is important for thermoluminescence (TL) dating of porcelain. The principle of pre-dose dating is based on two characteristics: thermal activation and radiation quenching of the porcelain. Based on these principles, two measurement methods, "the activation method" and "the quenching method", respectively, have been developed for evaluation of the porcelain paleodose. The paleodose values obtained are the same for the ages in the range of 100―1000 a BP for porcelains measured by these two methods. But for dating at lower age limits (less than 100 a BP), the activation method is more accurate; conversely, at higher age limits (greater than 1000 a BP) the quenching method is more accurate. In addition, two specific calculating methods are described for a few porce-lains having anomalous activation and quenching characteristics that make these two methods invalid.     

安徽绩溪萤石的热释光性质

安徽绩溪萤石对β射线照射有良好的热释光响应。实验结果显示，辐照剂量增加，热释光发射随之增强，并在所研究的剂量范围内呈线性变化。选用BG2003释光谱仪对绩溪萤石进行热释光实验测试，获得的热释光生长曲线是一张三维热释光谱图。      

环境热释光剂量计比对

与日本化学分析中心进行了不同内容的环境热择光剂量计的比对。结果表明：双方的TLD无论是用X光机或放射源辐照，还是布放到环境中．结果都达到国内外的相关标准。     

复杂地质背景中的热释光应用初步研究

采用热释光光子计数的方法初步研究了鄂尔多斯盆地和安徽淮南煤田两种复杂地质背景中的热释光现象。研究结果表明：（1）深度小于1000m的浅表地层岩石标本的天然热释光量没有显著的异常，可以认为是晚第四纪以来的自然放射性效应的累加；（2）在深度2000m以上的地层，钻孔岩石标本的天然热释光统计显著呈现弱化趋势，甚至在4000m深度的岩石已经不具备生长热释光的条件；（3）岩性为石英砂岩的钻孔标本的天然热释光峰温的位置普遍移向高温方向，可以认为是该地层曾经遭受多次热事件作用的结果。     

Luminescence and Defect Properties of Novel Bluish-Green Phosphor β-Zn3(PO4)2∶Zr4+

Luminescence and defect properties of novel phosphor β-Zn3(PO4)2:Zr4 were systematically investigated. Corresponding to its lowest optical absorption transition at 240 nm, phosphor emits a bluish-green light at 485 nm, which yields the Stokes shift about 20000 cm-1. The unusual optical properties of Zr4 ion are ascribed to its uncommon coordination environment. In addition it shows intensive bluish-green long lasting phosphorescence(LLP) due to the existence of electron trap, which is generated by aliovalent substitution of Zr4 ion for the cation site in the matrix as shown in thermoluminescence(TL) spectrum.     

广西某金矿床石英热发光特征及其意义

含金石英热发光曲线以双峰、三峰为特征而区别于不含金石英。随成矿作用的演化,石英的热发光峰温趋于降低,发光强度趋于增加。变质热液石英脉,石英的热发光曲线简单,峰温高,发光强度低;岩浆热液石英脉以石英的高发光强度为特征;复合成因石英脉,石英的热光曲线复杂,发光强度的变化幅度大。     

Radiation dosimetry by potassium feldspar

The thermoluminescence (TL) properties of raw and annealed feldspar have been studied for their use in gamma dosimetry. The raw gamma exposed feldspar shows glow peaks at 120°C and 319°C. Gamma dose beyond 500 cGy can be measured without any significant fading even after 40 days of termination of exposure. The annealed feldspar shows a glow peak at 120°C after gamma exposure. This peak can be used to measure gamma doses beyond 25 cGy when the TL is measured after 24 h from termination of exposure.     

γ射线辐照玻璃着色的研究

本文叙述了对两种硅酸盐玻璃、光学玻璃和天然水晶,经~(60)Coγ射线辐照后,着色现象的观测,比较了辐照玻璃的光吸收谱和色心热稳定性能;最后,分析了对不同类型的玻璃,由辐照所产生的色心类型。     

SrAl2O4 ：Eu2+和SrAl2O4 ：Eu2+，Dy3+长余辉和热释光谱

对比研究了SrAl2O4:Eu2+和SrAl2O4:Eu2+,Dy3+的余辉特性和热释光谱,并探讨了Dy3+的掺杂对SrAl2O4:Eu2+陷阱能级的影响。XRD晶相分析表明: Eu2+和Dy3+的掺杂并没有改变SrAl2O4的晶体结构。发光分析表明：Dy3+的掺杂没有改变SrAl2O4:Eu2+的光致发光光谱和发光中心。热释光谱对比分析结果显示：Eu2+的掺杂在SrAl2O4的禁带中引入了两个深度不同的陷阱能级;Dy3+的掺杂并不改变原来陷阱能级的深度,却能够显著地增加原来浅陷阱能级的密度,从而改善了SrAl2O4:Eu2+的余辉特性。不同等待时间的热释光谱曲线显示：在室温下,不同陷阱能级衰减规律的差异以及陷阱能级间存在的电子转移,可能造成了SrAl2O4:Eu2+,Dy3+长余辉材料复杂的余辉衰减规律。