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Open Access Publications from the University of California

A New Measurement of the 60 keV Emission from Am-241 Using Metallic Magnetic Calorimeters

  • Author(s): Kim, GB;
  • Boyd, STP;
  • Cantor, RH;
  • Voyles, AS;
  • Morrell, JT;
  • Bernstein, LA;
  • Friedrich, S
  • et al.

We report a new measurement of the 60 keV transition from 241Am. It uses a metallic magnetic calorimeter gamma-ray detector calibrated in the region around 60 keV by four accurately known X-rays and gamma rays from the decay of 169Yb. We determine an energy of 59,539.3 ± 0.3 (stat) ± 0.3 (syst) eV, which is 1.6 ± 0.4 eV lower than the current literature value of 59,540.9 ± 0.1 eV. We discuss the sources of this uncertainty and approaches to address them.

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