辐照剂量增量对泥石流物质热释光等效剂量的影响  

The Effect of Radiation Intervals on the Thermoluminescence Equivalent Doses of Debris Flow Samples

作　　者：张彬[1,2,3] 魏明建[1,2,3] 何友兵 刘超[1,2,3] 周锐 张永栋[1,2,3] 

机构地区：[1]首都师范大学光断代实验室,北京100048 [2]资源环境与地理信息系统北京重点实验室,北京100048 [3]国家重点实验室培育基地--城市环境过程与数字模拟,北京100048

出　　处：《核电子学与探测技术》2012年第4期485-488,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金资助(40871017)项目;北京市教委科技计划基金重点资助(KZ200810028015)项目;北京市自然科学基金资助(8102013)项目

摘　　要：等效剂量的准确测定是进行地质样品热释光年龄测定的关键。采用不同辐照间隔增量测量泥石流物质标样,测得的等效剂量值是不同的,说明辐照剂量增量对泥石流物质样品等效剂量值存在影响。测试选用已知等效剂量为30 Gy的泥石流标样,按不同的辐照剂量增量进行等效剂量测定。2.5Gy/min的β源(90Sr-90Y)辐照剂量增量分别选用1、2、4、6 min时,测得的等效剂量分别为19.3、22.3、26.4、23.0 Gy;8 Gy/min的β源(90Sr-90Y)辐照剂量增量分别选用0.5、1、1.5、2 min时,测得的等效剂量分别为17.6、19.6、25.3、15.6 Gy。研究表明:对于30 Gy的泥石流标样,剂量率为2.5 Gy/s的β源(90Sr-90Y)测定泥石流物质时最适合的辐照剂量增量为4 min。剂量率为8 Gy/s的β源(90Sr-90Y)测定泥石流物质时最适合的辐照剂量增量为1.5 min。The accurate measurement of equivalent doses is the key to the dating of debris flow samples. Using different radiation intervals measure debris flow material samples, the equivalent doses obtained are different, indicating irradiation interval impacts the equivalent dose of the debris flow material samples. Test debris flow samples used the known equivalent dose of 30 Gy, and measure them in different intervals of irradiation dosimetry. 2.5 Gy/rain β -source （9^90St -90y） irradiation intervals were selected to 1, 2, 4,6 rain, the equivalent close obtained respectively 19.3, 22.3, 26.4, 23.0 Gy; 8 Gy/rain of 13 source （^90St -^90y） irradiation intervals were selected to 0.5, 1, 1.5,2 min, the equivalent dose obtained respectively 17.6, 19.6 , 25.3, 15.6 Gy. The research indicate that he most suitable irradiation interval which by the dose rate 2.5 Gy / rain of the 13 source （^90St- ^90y）measure the debris flow material is 4 min. And the most suitable irradiation interval which by the dose rate 8 Gy/rain of the β source （^90Sr- ^90y） measure the debris flow material is 1.5 min.

关 键 词：辐照剂量增量 泥石流 等效剂量 

分 类 号：TL824[核科学技术—核技术及应用]