北京以北沙漠砂样的选频释光特征研究  

Characteristic of selected frequency luminescence for samples collected in deserts north to Beijing

作　　者：李东旭[1] 魏明建[1] 王均平[1] 潘宝林[1] 赵世元[1] 刘兆文[1] 

机构地区：[1]首都师范大学光断代实验室,北京100048

出　　处：《核技术》2009年第2期105-109,共5页Nuclear Techniques

基　　金：北京市教委科技计划基金重点资助(KZ200810028015)项目

摘　　要：采用BG2003释光仪对北京北方科尔沁沙地和浑善达克沙地表层砂的选频释光特征进行了研究,发现在热激发条件下,在85℃–135℃和350℃–400℃温度区间光子计数最多的来源于4.13eV(300nm)、4.00eV(310nm)、3.88eV(320nm)和2.70eV(460nm);在绿光(2.33eV,532nm)激发条件下,释光光子的能量分别为4.00eV(310nm)、3.88eV(320nm)和2.70eV(460nm)。同时,8个采样点上述能量的释光光子计数在一定剂量范围内随辐照剂量增加而增大。特征波长具备了对辐射剂量响应的条件,可分别用于年代测定。Surface sand samples were collected in eight sites of the Horqin and Otindag deserts located in north to Beijing. BG2003 luminescence spectrograph was used to analyze the emitted photons and characteristic spectra of the selected frequency luminescence were obtained. It was found that high intensities of emitted photons stimulated by heat from 85℃-135℃ and 350℃-400℃. It belong to the traps of 4.13 eV（300 nm）, 4.00 eV（310 nm）, 3.88 eV（320 nm） and 2.70 eV（460 nm）, and the emitted photons belong to traps of 4.00 eV（310 nm）, 3.88 eV（320 nm） and 2.70 eV（460 nm） were stimulated by green laser. And sand samples of the eight sites cart respond to the increase of definite radiological dose at each wavelength, which is the characteristic spectrum to provide radiation dosimetry basis for dating. There are definite district characteristic in their characteristic spectra.

关 键 词：选频释光 特征图谱 沙漠砂 

分 类 号：TL824[核科学技术—核技术及应用]