Superconducting Transition Edge Sensor for Gamma-Ray Spectroscopy

• DOI: 10.1587/transele.e100.c.283
• Publication Date: 2017-03-01T00:55:26Z
• Authors: Masashi OHNO; Tomoya IRIMATSUGAWA; Hiroyuki TAKAHASHI; Chiko OTANI; Takashi YASUMUNE; Koji TAKASAKI; Chikara ITO; Takashi OHNISHI; Shin-ichi KOYAMA; Shuichi HATAKEYAMA; R.M. Thushara. DA...
• Keywords: Transition edge sensor; Nuclide; Thermometer

Superconducting Transition edge sensor (TES) coupled with a heavy metal absorber is promising microcalorimeter for Gamma-ray (γ-ray) spectroscopy ultra-high energy resolution and high detection efficiency. It very useful the non-destructed inspection of nuclide materials. High resolving power γ-ray peaks can precisely identify multiple nuclides such as Plutonium (Pu) Actinides efficiency safety. For this purpose, we have developed TES tin absorber. We suggest new device structure using gold bump post which connects to thermometer superconducting Ir/Au bilayer. thermal conductivity realized strong coupling between absorber, it brought benefit large pulse height fast decay time. Our achieved good 84 eV FWHM at 59.5 keV. Using device, also succeeded demonstrate nuclear material measurements. In measurement Pu sample, detected sharp from 239Pu 240Pu, Fission Products (FP) observed fluorescence X-ray emitted by elements contained in FP. The could resolve fine structures each line like Kα1 Kα2. addition that, tantalum expected higher absorption γ-rays. This reported best 465 662