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| Titel |
Chemistry composition analyses of site area of Russian interplanetary probe Phobos-Grunt by neutrons and gamma-rays spectrometer NS HEND. |
| VerfasserIn |
A. S. Kozyrev, M. L. Litvak, A. A. Malakhov1, M. I. Mokrousov, I. G. Mitrofanov, A. A. Rogozhin, A. B. Sanin, R. Schulz, V. N. Schvetsov, V. I. Tretyakov |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027510
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| Zusammenfassung |
| The Neutron Spectrometer HEND (NS HEND) is developed for studying elemental
composition of Phobos regolith. Composition of shallow subsurface of Phobos could be
investigated by observations of nuclear gamma-ray lines and neutrons, which are produced by
galactic cosmic rays. The “forest” of nuclear lines in the spectrum of gamma-rays
represents the content of each particular chemical element in the subsurface. The flux of
thermal and epithermal neutrons chcracterize the content of hydrogen in the shallow
subsurface.
The concept of NS HEND instrument is based on Russian instrument HEND
onboard currently operating NASA’s Mars Odyssey mission. Additional element
of NS HEND instrument is gamma-ray spectrometer, which allows to measure
gamma-ray lines together with neutrons. This gamma-ray spectrometer uses new
innovative scintillation crystal LaBr3, which allows to obtain perfect spectral resolution
of nuclear lines (3% at 662 keV). Instrument also includes the set of three 3He
proportional counters inside polyethylene and cadmium enclosures for measurements of
thermal and epithermal neutrons and sensor with crystal of stilben for measurements
of fast and high energy neutrons with energies from 0.5 MeV up 10 MeV). The
total mass for this instrument is 3.8 kg and the power consumption is less than 8.0
W.
This instrument, as the part of the payload of “Phobos-Grunt” mission, will be able to
characterize the composition of Phobos regolith, the content of natural radioactive elements
K, U and Th, and also the content of hydrogen, which could be compared with the similar
data for regolith samples, which should be returned back the the Earth by the return module
of this mission. |
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