Abstract
A recent study of radionuclides used for the calibration of gamma-ray detection systems highlighted 56Co as one for which a better half-life value and improved standards are required.A EUROMET project was established between three national standards laboratories to standardize a solution of 56Co and to conduct new measurements of the half-life.The standardization results agreed within the uncertainties. For the half-life, values of 77.210±0.028 and 77.290±0.040 d were obtained. After a re-evaluation of published half-life data, a value of 77.233±0.027 d is recommended.
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