Preliminary study of^10Be/^7Be in rainwater from Xi'an by Accelerator Mass Spectrometry  

作　　者：张丽 付云翀 

机构地区：[1]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment,Chinese Academy of Sciences [2]Xi’an AMS Center, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application [3]University of Chinese Academy of Sciences

出　　处：《Chinese Physics C》2017年第1期202-206,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11205161);CAS Key Technology Talent Program

摘　　要：The ^10Be/^7Be ratio is a sensitive tracer for the study of atmospheric transport, particularly with regard to stratosphere-troposphere exchange. Measurements with high accuracy and efficiency are crucial to ^7Be and ^10Be tracer studies. This article describes sample preparation procedures and analytical benchmarks for ^7Be and ^10Be measurements at the Xi＇an Accelerator Mass Spectrometry（Xi＇an-AMS） laboratory for the study of rainwater samples. We describe a sample preparation procedure to fabricate beryllium oxide（Be O） AMS targets that includes co-precipitation, anion exchange column separation and purification. We then provide details for the AMS measurement of ^7Be and ^10Be following the sequence BeO^-→Be^2＋→Be^4＋ in the Xi＇an- AMS. The ^10Be/^7Be ratio of rainwater collected in Xi＇an is shown to be about 1.3 at the time of rainfall. The virtue of the method described here is that both ^7Be and ^10Be are measured in the same sample, and it is suitable for routine analysis of large numbers of rainwater samples by AMS.The ^10Be/^7Be ratio is a sensitive tracer for the study of atmospheric transport, particularly with regard to stratosphere-troposphere exchange. Measurements with high accuracy and efficiency are crucial to ^7Be and ^10Be tracer studies. This article describes sample preparation procedures and analytical benchmarks for ^7Be and ^10Be measurements at the Xi＇an Accelerator Mass Spectrometry（Xi＇an-AMS） laboratory for the study of rainwater samples. We describe a sample preparation procedure to fabricate beryllium oxide（Be O） AMS targets that includes co-precipitation, anion exchange column separation and purification. We then provide details for the AMS measurement of ^7Be and ^10Be following the sequence BeO^-→Be^2＋→Be^4＋ in the Xi＇an- AMS. The ^10Be/^7Be ratio of rainwater collected in Xi＇an is shown to be about 1.3 at the time of rainfall. The virtue of the method described here is that both ^7Be and ^10Be are measured in the same sample, and it is suitable for routine analysis of large numbers of rainwater samples by AMS.

关 键 词：accelerator mass spectrometry ^7Be ^10BE RAINWATER atmospheric tracer 

分 类 号：P426.612[天文地球—大气科学及气象学]