国内外对于79Se的测量数据尚存在较大分歧,所发表的数据有较大的出入。本课题拟对79Se高丰度比(79Se/Se～10-7)含量的样品进行加速器质谱(AMS)绝对测量。AMS是一种基于标准样品的相对分析方法,但是无法落实79Se标准样品,所以只能采用绝对测量方法。AMS测量79Se/Se的基本原理是交替注入78Se、79Se和80Se,并利用探测器测量这些同位位的计 At home and abroad 79Se survey data there is still a big difference, the published data have a greater discrepancy. This topic intends to 79Se high abundance ratio (79Se / Se ~ 10-7) content of the sample by accelerator mass spectrometry (AMS) absolute measurement. AMS is a standard sample-based method of relative analysis, but it is not possible to implement 79Se standard samples, so only absolute measurement methods should be used. The basic principle of AMS measurement of 79Se / Se is to alternately inject 78Se, 79Se and 80Se and measure these isotopes using a detector