北京白河流域现代泥石流物质热释光本底研究  

The Research of TL Background Radiation for Modern Debris Flow Materials in White River Basin Beijing

作　　者：刘俊新[1,2,3] 魏明建[1,2,3] 周锐[1,2,3] 张彬[1,2,3] 刘田田[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》2013年第3期384-387,共4页Nuclear Electronics & Detection Technology

基　　金：北京市自然科学基金资助项目(8102013);北京市自然科学基金重点项目B类(KZ201210028034);国家自然科学基金资助项目(40871017)

摘　　要：通过对北京白河流域柯太沟、西白莲峪两条泥石流沟谷堆积物的热释光测定,研究现代泥石流物质的热释光本底,得出泥石流物质在流动过程中其热释光信号存在明显的减弱现象。物源区、流通区和堆积区的等效剂量平均值分别为63.19、52.42和49.54 Gy。且因光晒退的影响,两条沟谷每个样点的表层本底值均小于距表层5～10 cm的深层本底值。北京白河流域泥石流堆积表层物质的残留本底值在11.2～28.5 ka之间,这一结果是应用古泥石流物质进行热释光测年的基础,为古泥石流测年提供了依据。The TL background radiation of the modem debris flow materials of KeTai and XiBaiLianYu Gully, which in White River Basin of Beijing, was studied using the thermo luminescence technology. The research indicates that the thermo luminescence signal of debris flow materials reduced obviously in the process of flow. The average equivalent doses of the provenance, circulation area and the accumulation area are respectively 63.19, 52.42and 49.54 Gy. Because of the light fading, the surface sample＇s background radiation is less than that of the samples 5 - 10cm from the surface. The residual background radiation of the surface debris flow material in White River Basin is between 11.2 to 28.5 ka and the result provides a foundation for using thermo luminescence technology to date old debris flow.

关 键 词：白河流域 等效剂量 释光本底 

分 类 号：TL824[核科学技术—核技术及应用]