title: Development of a microcalorimeter with transition edge sensor for detection of LX rays emitted by transuranium elements.
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 (241)Am source at an operating temperature of 140 mK. An energy resolution of ~80 eV (full width at the half maximum) was obtained for L(β1)X ray of 17.75 keV.
authors.affiliation: Nuclear Fuel Cycle Engineering Laboratories, Tokai Research and Development Center, Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194, Japan. nakamura.keisuke@jaea.go.jp
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nakamura
authors.forename: Makoto
authors.initials: M
authors.lastname: Maeda
authors.forename: Takashi
authors.initials: T
authors.lastname: Yasumune
authors.forename: Keisuke
authors.initials: K
authors.lastname: Maehata
authors.forename: Kenji
authors.initials: K
authors.lastname: Ishibashi
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tanaka
authors.forename: Takahiro
authors.initials: T
authors.lastname: Umeno
authors.forename: Koji
authors.initials: K
authors.lastname: Takasaki
authors.forename: Takumaro
authors.initials: T
authors.lastname: Momose
mesh_terms: D000576:Americium / Q000737:chemistry*; D002151:Calorimetry / Q000295:instrumentation*; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D006801:Humans; D044367:Phase Transition; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014965:X-Rays
chemical_list: D006046:Gold; D014025:Titanium; D000576:Americium