Complexities of gamma-ray line intensities from the lunar surface

Naoyuki Yamashita, Nobuyuki Hasebe, Takashi Miyachi, Masanori Kobayashi, Osamu Okudaira, Shingo Kobayashi, Takeshi Ishizaki, Kunitomo Sakurai, Mitsuhiro Miyajima, Robert C. Reedy, Claude d'Uston, Sylvestre Maurice, Olivier Gasnault

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Assuming different abundances of the Apollo lunar soil samples and the average spectrum of galactic cosmic ray protons, energy spectra of neutrons and gamma rays and emission rates of gamma-ray lines from major elements have been estimated by using the reviewed Monte Carlo simulation library Geant4 and nuclear data. Previously, such libraries were not able to reproduce gamma-ray lines properly for the planetary application. Results clearly show that the emission rate of gamma rays heavily depends not only on the chemical abundance but also neutron flux within the lunar subsurface. While the intensities of gamma-ray lines are mostly proportional to elemental abundances, the intensity per unit elemental abundance can vary. Such a complex correlation is attributed to the change in neutron flux within the lunar subsurface and petrological restriction of elemental variation.

    Original languageEnglish
    Pages (from-to)313-319
    Number of pages7
    JournalEarth, Planets and Space
    Volume60
    Issue number4
    Publication statusPublished - 2008

    Fingerprint

    lunar surface
    gamma rays
    flux (rate)
    lunar soil
    cosmic ray
    proton energy
    constrictions
    rays
    energy spectra
    neutrons
    simulation
    energy
    library
    rate

    Keywords

    • Gamma ray
    • GRS
    • Lunar and planetary spectroscopy
    • Moon
    • Neutron
    • SELENE

    ASJC Scopus subject areas

    • Earth and Planetary Sciences (miscellaneous)
    • Geology
    • Space and Planetary Science

    Cite this

    Yamashita, N., Hasebe, N., Miyachi, T., Kobayashi, M., Okudaira, O., Kobayashi, S., ... Gasnault, O. (2008). Complexities of gamma-ray line intensities from the lunar surface. Earth, Planets and Space, 60(4), 313-319.

    Complexities of gamma-ray line intensities from the lunar surface. / Yamashita, Naoyuki; Hasebe, Nobuyuki; Miyachi, Takashi; Kobayashi, Masanori; Okudaira, Osamu; Kobayashi, Shingo; Ishizaki, Takeshi; Sakurai, Kunitomo; Miyajima, Mitsuhiro; Reedy, Robert C.; d'Uston, Claude; Maurice, Sylvestre; Gasnault, Olivier.

    In: Earth, Planets and Space, Vol. 60, No. 4, 2008, p. 313-319.

    Research output: Contribution to journalArticle

    Yamashita, N, Hasebe, N, Miyachi, T, Kobayashi, M, Okudaira, O, Kobayashi, S, Ishizaki, T, Sakurai, K, Miyajima, M, Reedy, RC, d'Uston, C, Maurice, S & Gasnault, O 2008, 'Complexities of gamma-ray line intensities from the lunar surface', Earth, Planets and Space, vol. 60, no. 4, pp. 313-319.
    Yamashita N, Hasebe N, Miyachi T, Kobayashi M, Okudaira O, Kobayashi S et al. Complexities of gamma-ray line intensities from the lunar surface. Earth, Planets and Space. 2008;60(4):313-319.
    Yamashita, Naoyuki ; Hasebe, Nobuyuki ; Miyachi, Takashi ; Kobayashi, Masanori ; Okudaira, Osamu ; Kobayashi, Shingo ; Ishizaki, Takeshi ; Sakurai, Kunitomo ; Miyajima, Mitsuhiro ; Reedy, Robert C. ; d'Uston, Claude ; Maurice, Sylvestre ; Gasnault, Olivier. / Complexities of gamma-ray line intensities from the lunar surface. In: Earth, Planets and Space. 2008 ; Vol. 60, No. 4. pp. 313-319.
    @article{059bc222d9f64e1ba7722d8873bff232,
    title = "Complexities of gamma-ray line intensities from the lunar surface",
    abstract = "Assuming different abundances of the Apollo lunar soil samples and the average spectrum of galactic cosmic ray protons, energy spectra of neutrons and gamma rays and emission rates of gamma-ray lines from major elements have been estimated by using the reviewed Monte Carlo simulation library Geant4 and nuclear data. Previously, such libraries were not able to reproduce gamma-ray lines properly for the planetary application. Results clearly show that the emission rate of gamma rays heavily depends not only on the chemical abundance but also neutron flux within the lunar subsurface. While the intensities of gamma-ray lines are mostly proportional to elemental abundances, the intensity per unit elemental abundance can vary. Such a complex correlation is attributed to the change in neutron flux within the lunar subsurface and petrological restriction of elemental variation.",
    keywords = "Gamma ray, GRS, Lunar and planetary spectroscopy, Moon, Neutron, SELENE",
    author = "Naoyuki Yamashita and Nobuyuki Hasebe and Takashi Miyachi and Masanori Kobayashi and Osamu Okudaira and Shingo Kobayashi and Takeshi Ishizaki and Kunitomo Sakurai and Mitsuhiro Miyajima and Reedy, {Robert C.} and Claude d'Uston and Sylvestre Maurice and Olivier Gasnault",
    year = "2008",
    language = "English",
    volume = "60",
    pages = "313--319",
    journal = "Earth, Planets and Space",
    issn = "1343-8832",
    publisher = "Terra Scientific Publishing Company",
    number = "4",

    }

    TY - JOUR

    T1 - Complexities of gamma-ray line intensities from the lunar surface

    AU - Yamashita, Naoyuki

    AU - Hasebe, Nobuyuki

    AU - Miyachi, Takashi

    AU - Kobayashi, Masanori

    AU - Okudaira, Osamu

    AU - Kobayashi, Shingo

    AU - Ishizaki, Takeshi

    AU - Sakurai, Kunitomo

    AU - Miyajima, Mitsuhiro

    AU - Reedy, Robert C.

    AU - d'Uston, Claude

    AU - Maurice, Sylvestre

    AU - Gasnault, Olivier

    PY - 2008

    Y1 - 2008

    N2 - Assuming different abundances of the Apollo lunar soil samples and the average spectrum of galactic cosmic ray protons, energy spectra of neutrons and gamma rays and emission rates of gamma-ray lines from major elements have been estimated by using the reviewed Monte Carlo simulation library Geant4 and nuclear data. Previously, such libraries were not able to reproduce gamma-ray lines properly for the planetary application. Results clearly show that the emission rate of gamma rays heavily depends not only on the chemical abundance but also neutron flux within the lunar subsurface. While the intensities of gamma-ray lines are mostly proportional to elemental abundances, the intensity per unit elemental abundance can vary. Such a complex correlation is attributed to the change in neutron flux within the lunar subsurface and petrological restriction of elemental variation.

    AB - Assuming different abundances of the Apollo lunar soil samples and the average spectrum of galactic cosmic ray protons, energy spectra of neutrons and gamma rays and emission rates of gamma-ray lines from major elements have been estimated by using the reviewed Monte Carlo simulation library Geant4 and nuclear data. Previously, such libraries were not able to reproduce gamma-ray lines properly for the planetary application. Results clearly show that the emission rate of gamma rays heavily depends not only on the chemical abundance but also neutron flux within the lunar subsurface. While the intensities of gamma-ray lines are mostly proportional to elemental abundances, the intensity per unit elemental abundance can vary. Such a complex correlation is attributed to the change in neutron flux within the lunar subsurface and petrological restriction of elemental variation.

    KW - Gamma ray

    KW - GRS

    KW - Lunar and planetary spectroscopy

    KW - Moon

    KW - Neutron

    KW - SELENE

    UR - http://www.scopus.com/inward/record.url?scp=46849109710&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=46849109710&partnerID=8YFLogxK

    M3 - Article

    AN - SCOPUS:46849109710

    VL - 60

    SP - 313

    EP - 319

    JO - Earth, Planets and Space

    JF - Earth, Planets and Space

    SN - 1343-8832

    IS - 4

    ER -