Development of a microcalorimeter with transition edge sensor for detection of LX rays emitted by transuranium elements

Keisuke Nakamura, Makoto Maeda, Takashi Yasumune, Keisuke Maehata, Kenji Ishibashi, Keiichi Tanaka, Takahiro Umeno, Koji Takasaki, Takumaro Momose

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Abstract

A transition edge sensor (TES) microcalorimeter has been developed for use as an energy dispersive X-ray spectrometer. The TES microcalorimeter is a thermal detector that enables one to determine the energy of an incident photon by measuring the resultant increase in temperature. In this work, a Ti/Au TES microcalorimeter was developed to measure LX rays emitted by transuranium elements. The phase transition temperature was set at ~200 mK by using a bilayer structure composed of a 110-nm-thick Au layer and a 40-nm-thick Ti layer. An Au of 5 μm thickness was deposited on the Ti/Au bilayer to achieve an absorption efficiency of 35-80 % for the energy range of LX rays (10-25 keV). The developed TES microcalorimeter was irradiated with LX rays emitted by an 241Am source at an operating temperature of 140 mK. An energy resolution of ~80 eV (full width at the half maximum) was obtained for L. β1X ray of 17.75 keV.

Original languageEnglish
Article numberncr118
Pages (from-to)88-91
Number of pages4
JournalRadiation Protection Dosimetry
Volume146
Issue number1-3
DOIs
Publication statusPublished - Jul 1 2011

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All Science Journal Classification (ASJC) codes

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

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