Gamma-Ray Spectroscopy for 237Np Using a Transition-Edge Sensor with a Thick-Trilayer Membrane

被引：0

作者：

Kikuchi, T. ^{[1
]}

Fujii, G. ^{[1
]}

Hayakawa, R. ^{[1
,2
]}

Smith, R. ^{[3
]}

Hirayama, F. ^{[1
]}

Sato, Y. ^{[1
]}

Kohjiro, S. ^{[1
]}

Ukibe, M. ^{[1
]}

Ohno, M. ^{[3
]}

Sato, A. ^{[1
]}

Yamamori, H. ^{[1
]}

Hamaguchi, T. ^{[4
]}

Yasumune, T. ^{[4
]}

Ito, C. ^{[4
]}

Takasaki, K. ^{[4
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba 3058568, Japan

[2] Tokyo Metropolitan Univ, Hachioji, Tokyo 1920397, Japan

[3] Univ Tokyo, Bunkyo Ku, Tokyo 1138656, Japan

[4] Japan Atom Energy Agcy, Oarai, Ibaraki 3111393, Japan

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2023年 / 211卷 / 5-6期

关键词：

Gamma-ray spectroscopy; Neptunium; 237; Non-destructive analysis; Transuranic radionuclides; Transition edge sensor; Trilayer membrane;

D O I：

10.1007/s10909-022-02867-w

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Gamma-ray transition edge sensors (TESs) are intensively studied not only to measure isotopic composition of nuclear materials but to monitor transuranic radionuclides inside the human body. We have recently proposed a thick-trilayer membrane as an alternative to silicon-nitride (SixNy) single-layer ones. It consists of silicon dioxide (SiO2), SixNy, and SiO2 layers. Their total thickness is 6.9 mu m and exhibits almost the same thermal conductance as conventional SixNy ones with 1-mu m thickness. The thick-trilayer membrane is expected to have better mechanical strength against implementing heavy-bulk absorbers. In this paper, the gamma-ray TES with the thick-trilayer membrane is used to carry out the spectroscopy for the nuclear radiation source. Neptunium-237 and its decay product Protactinium-233 emit 86.5 and 86.6-keV lines, respectively, and they are clearly resolved by four pixels with the full-width-half-maximum (FWHM) resolution of (43.7 +/- 0.9) eV. Furthermore, their intensity ratio agrees with the radioactive equilibrium between the two nuclides. Our experimental results predict that a vast array of pixel formats will reduce the statistical uncertainty in less measuring time.

引用

页码：207 / 213

页数：7

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