Abstract:
As there is no
79Se standard sample for measurement of
79Se, the characterizations of
79Se are conducted by isotope ratio of
78Se/Se or
80Se/Se since the abundances of
78Se and
80Se are well known. However, beams of
78Se and
80Se both exceed the upper limit of semiconductor detector resulting in measurement failure. As a result, attenuators were introduced into the CIAEAMS system with the aim to measure the
79Se. The results indicate that the beam of
78Se and
80Se is decreased into the detecting range of semiconductor detector by two attenuators, which would improve measurement sensitivity and efficiency significantly. In addition, the uncertainty of measurement is reduced greatly and it lays the foundation for the accuracy measurement of the half life of
79Se.
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