²⁴³Am certified reference material for mass spectrometry

The Joint Research Centre, in cooperation with the Commissariat a l'Energie Atomique et aux Energies Alternatives, produced a novel ²⁴³Am spike reference material for mass spectrometry. Americium solution with an isotopic composition of 88% ²⁴³Am and 12% ²⁴¹Am was used as the source for the preparation of the spike material. The certified value of 5.696 (11) nmol g^-1 for the amount content of ²⁴³Am and 0.136138 (54) for the n(²⁴¹Am)/n(²⁴³Am) amount ratio were assigned. The assigned values from mass spectrometry were confirmed by alpha-particle spectrometry, alpha-particle counting at a defined solid angle, and high-resolution gamma-ray spectrometry. Furthermore, an external validation of the certified values was obtained from the results of an interlaboratory comparison exercise, using this americium reference solution as the test sample. (author)