摘要
环境剂量率的准确测量是获得可靠ESR年代的关键问题之一。本文采用X射线荧光光谱法,在低X射线功率和基体效应消除基础上定量测定水系沉积物的U、Th、K含量,并与传统的α计数仪-原子吸收光谱法比较,两种方法获得的环境剂量率差异在5%以内。这表明X射线荧光光谱法可用于水系沉积物ESR测年中的U、Th、K含量测定,同时该测量方法具有测定速度快、可重复、无损测量等优点。
The accurate measurement of dose rate is the key issues to obtain reliable ESR age. In this article, we used X-ray fluorescence spectrometry to determine the U, Th, K content of the fluvial sediments. And the standard working curves were established using the national rock reference material. Setting the lower X-ray power and the matrix effect, U, Th, K content in the fluvial sediment were investigated. The results show that the method recovery rate of U and Th is less than 15 %. Comparing with the measurement data from the α-counting and Atomic Spectrometry analysis, the dose rate difference is less than 5 %. It shows that the X-ray fluorescence spectrometry method can fit for the requirement for obtaining the U, Th, K content of fluvial sediment for ESR dating.
出处
《核技术》
CAS
CSCD
北大核心
2012年第11期837-840,共4页
Nuclear Techniques
基金
国家自然科学基金(40902051)
地震动力学国家重点实验室自主研究课题(LED2009A04)共同资助
关键词
环境剂量率
ESR
X射线荧光光谱
水系沉积物
Environmental Dose, ESR, X-ray fluorescence spectrometry Method, Fluvial Sediments