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Proceedings Paper

A high performance neutron spectrometer for planetary hydrogen measurement
Author(s): Masayuki Naito; Nobuyuki Hasebe; Hiroshi Nagaoka; Junya Ishii; Daisuke Aoki; Eido Shibamura; Kyeong J. Kim; José A. Matias-Lopes; Jesús Martínez-Frías
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Paper Abstract

The elemental composition and its distribution on planetary surface provide important constraints on the origin and evolution of the planetary body. The nuclear spectrometer consisting of a neutron spectrometer and a gamma-ray spectrometer obtains elemental compositions by remote sensing. Especially, the neutron spectrometer is able to determine the hydrogen concentration, a piece of information that plays an important role in thermal history of the planets. In this work, numerical and experimental studies on the neutron spectrometer for micro-satellite application were conducted. It is found that background count rate of neutron produced from micro-satellite is very small, which enables to obtain successful results in short time observation. The neutron spectrometer combining a lithium-6 glass scintillator with a boron loaded plastic scintillator was used to be able to detect neutrons in different energy ranges. It was experimentally confirmed that the neutron signals from these scintillators were successfully discriminated by the difference of scintillation decay time between two detectors. The measurement of neutron count rates of two scintillators is found to determine hydrogen concentration on the planetary surfaces in the future missions.

Paper Details

Date Published: 24 August 2017
PDF: 8 pages
Proc. SPIE 10392, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX, 103920C (24 August 2017); doi: 10.1117/12.2273735
Show Author Affiliations
Masayuki Naito, Waseda Univ. (Japan)
Nobuyuki Hasebe, Waseda Univ. (Japan)
Hiroshi Nagaoka, Waseda Univ. (Japan)
Junya Ishii, Waseda Univ. (Japan)
Daisuke Aoki, Waseda Univ. (Japan)
Eido Shibamura, Waseda Univ. (Japan)
Kyeong J. Kim, Korea Institute of Geoscience & Mineral Resources (Korea, Republic of)
José A. Matias-Lopes, Univ. de Coimbra (Portugal)
Jesús Martínez-Frías, Complutense Univ. of Madrid (Spain)

Published in SPIE Proceedings Vol. 10392:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX
Arnold Burger; Ralph B. James; Michael Fiederle; Larry Franks; Stephen A. Payne, Editor(s)

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