Abstract
There are a number of discrepancies in the reported gamma-ray emission probabilities of 75Se. An international work programme was proposed and agreed by members of the Beta- and Gamma-ray Spectrometry Working Group (SWG) of the International Committee for Radionuclide Metrology (ICRM) to study these data. The first step has been the measurement and intercomparison of the relative gamma-ray emission rates, the second step will be a series of activity measurements conducted under the auspices of the Bureau International des Poids et Mesures (BIPM), while the final stage will involve the combination of these two previous sets of data to deduce the gamma-ray emission probabilities per decay for 75Se. The organisation of the international measurement programme for the relative gamma-ray emission probabilities, the source supplied, and the evaluation methods are described. The results are also discussed in terms of the applicability of 75Se as a calibration standard. Finally, future plans to complete the programme are briefly outlined.
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