Determination of ^(79)Se with accelerator mass spectrometry technique

So far accelerator mass spectrometry （AMS） technique has been used for the determination of numbers of important long-lived radioisotopes, such as 10Be, 14C, 26Al, 36Cl, 41Ca and 129I, in their applications of geoscienee, environmental science, archaeology and biomedical research. It is interesting to determine 79Se with AMS technique for its potential application in biomedical research and environmental science presently. The published half-life values of 79Se are more than 2 orders of magnitude apart, ranging from 103 to 106 a. The uncertainty of the half life has been an obstacle to the 79Se application as a tracer. Selenium is one of the impor-