A high performance neutron spectrometer for planetary hydrogen measurement

Masayuki Naito*, Nobuyuki Hasebe, Hiroshi Nagaoka, Junya Ishii, Daisuke Aoki, Eido Shibamura, Kyeong J. Kim, José A. Matias-Lopes, Jesús Martínez-Frías

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    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.

    Original languageEnglish
    Title of host publicationHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX
    ISBN (Electronic)9781510612419
    Publication statusPublished - 2017 Jan 1
    EventHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX 2017 - San Diego, United States
    Duration: 2017 Aug 72017 Aug 9


    OtherHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX 2017
    Country/TerritoryUnited States
    CitySan Diego


    • A boron loaded plastic scintillator
    • A lithium glass plastic scintillator
    • Hydrogen concentration
    • Microsatellite
    • Neutron spectrometer
    • Nuclear spectroscopy
    • Pulse discrimination

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering


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