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The half-life of  243 Am has been measured by an absolute and a relative method, i.e. by determining the specific activity of  243 Am and the specific activity ratio with  241 Am. A mixed  241,243 Am reference material was produced and certified for its americium mass content and its isotope amount ratios. The characterisation of the mass content of  243 Am was established by isotope dilution mass spectrometry using an  241 Am spike, produced from highly enriched  241 Pu material. The isotope amount ratios  n ( 241 Am)/ n ( 243 Am) and  n ( 242m Am)/ n ( 243 Am) were measured by thermal ionisation mass spectrometry. Activity measurements were performed by alpha-particle counting at a defined solid angle, as well as high-resolution alpha-particle spectrometry. From the  243 Am/ 241 Am activity and isotopic amount ratios, a value of 16.988 (24) was derived for the  243 Am/ 241 Am half-life ratio. Using a value of 432.6 (6) a for the  241 Am half-life, the corresponding  243 Am half-life value, 7349 (15) a, is in good agreement with the result obtained from the absolute method, 7342 (14) a. The mean value, 7345 (14) a, agrees well with data from literature and lowers the relative standard uncertainty to 0.2%.

Absolute and relative measurement of the 243Am half-life