[19a-W810-1~10] 2.2 Detection systems

[19a-W810-10] Spectroscopic Measurements of L X rays emitted from ²⁴⁴Cm sources with using TES microcalorimeters

〇Keisuke Maehata¹, Tetsuya Sugimoto¹, Naoko Iyomoto¹, Kenji Ishibashi¹, Keisuke Nakamura², Yuki Morishita², Koji Takasaki², Kazuhisa Mitsuda³ (1.Kyushu Univ., 2.JAEA, 3.JAXA)

Keywords:TES microcalorimeter,Transuranium elements,Spectroscopic measurement of L X ray

L X rays with the energy from 10 keV to 20 keV are emitted from most transuranium elements (TRU) following their α decays with relatively high probability. ²⁴⁴Cm is a typical TRU in a nuclear fuel reprocessing. In this work, spectroscopic measurement was conducted for L X rays emitted from a ²⁴⁴Cm source with using a TES microcalorimeter. The TES microcalorimeter consisted of a Au absorber of 5 μm thick. The surface area of the Au absorber was 160 x 160 μm². The energy resolution of the TES microcalorimeter was obtained to be 39 eV FWHM by analyzing a Pu L_α1 peak of 14.28 keV in the experimental energy spectrum of L X rays emitted from the ²⁴⁴Cm source.