Spectroscopic measurement of L X-rays emitted by 241Am source by TES microcalorimeter

M. Maeda, K. Yamaguchi, K. Maehata, N. Iyomoto, K. Ishibashi, K. Takasaki, K. Nakamura, K. Tanaka, Y. Yamanaka

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Nondestructive plutonium monitoring during reprocessing of spent nuclear fuel and in mixed-oxide-fuel fabrication facilities is expected to require spectroscopic measurements of L X-rays ranging from 10 to 20 keV. To this end, L X-ray emission intensities of transuranium elements will be important parameters in estimating the plutonium isotopic composition from L X-ray spectra. However, owing to fine structure within the L X-ray spectra, significant discrepancies exist among theoretical values, reference and experimental data concerning these emission intensities. To obtain better spectroscopic measurements, we used a TES microcalorimeter to get the energy spectrum of L X-rays emitted by 237Np resulting from α-decay of a 241Am source. Values for the L X-ray emission intensities were estimated by analyzing the spectral data and compared with previous data. We advocate for improvements in evaluation of emission intensities given the enhanced precision afforded by TES microcalorimetry.

Original languageEnglish
Pages (from-to)754-758
Number of pages5
JournalJournal of Low Temperature Physics
Issue number5-6
Publication statusPublished - Jun 2012

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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