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Title: Distribution of iron&titanium on the lunar surface from lunar prospector gamma ray spectra

Abstract

Gamma ray pulse height spectra acquired by the Lunar Prospector (LP) Gamma-Ray Spectrometer (GRS) contain information on the abundance of major elements in the lunar surface, including O, Si, Ti, Al, Fe, Mg, Ca, K, and Th. With the exception of Th and K, prompt gamma rays produced by cosmic ray interactions with surface materials are used to determine elemental abundance. Most of these gamma rays are produced by inelastic scattering of fast neutrons and by neutron capture. The production of neutron-induced gamma rays reaches a maximum deep below the surface (e.g. {approx}140 g/cm{sup 2} for inelastic scattering and {approx}50 g/cm{sup 2} for capture). Consequently, gamma rays sense the bulk composition of lunar materials, in contrast to optical methods [e.g. Clementine Spectral Reflectance (CSR)], which only sample the top few microns. Because most of the gamma rays are produced deep beneath the surface, few escape unscattered and the continuum of scattered gamma rays dominates the spectrum. In addition, due to the resolution of the spectrometer, there are few well-isolated peaks and peak fitting algorithms must be used to deconvolve the spectrum in order to determine the contribution of individual elements.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];
  1. (Thomas H.)
  2. (William C.)
  3. (David Jeffery),
  4. (Richard C.)
  5. (Olivier M.)
  6. (Sylvestre)
  7. (Kurt R.)
Publication Date:
Research Org.:
Los Alamos National Laboratory
Sponsoring Org.:
USDOE
OSTI Identifier:
975127
Report Number(s):
LA-UR-01-0536; LA-UR-01-536
TRN: US1002393
Resource Type:
Conference
Resource Relation:
Conference: "Submitted to: "32nd Lunar and planetary Science Conference, Houston, TX, March 12-16, 2001".
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ABUNDANCE; ALGORITHMS; CAPTURE; DISTRIBUTION; FAST NEUTRONS; INELASTIC SCATTERING; IRON; LUNAR MATERIALS; NEUTRON REACTIONS; PRODUCTION; RESOLUTION; SPECTRA; SPECTRAL REFLECTANCE; SPECTROMETERS; TITANIUM

Citation Formats

Prettyman, T. H., Feldman, W. C., Lawrence, David J., Elphic, R. C., Gasnault, O. M., Maurice, S., Moore, K. R., and Binder, A. B. Distribution of iron&titanium on the lunar surface from lunar prospector gamma ray spectra. United States: N. p., 2001. Web.
Prettyman, T. H., Feldman, W. C., Lawrence, David J., Elphic, R. C., Gasnault, O. M., Maurice, S., Moore, K. R., & Binder, A. B. Distribution of iron&titanium on the lunar surface from lunar prospector gamma ray spectra. United States.
Prettyman, T. H., Feldman, W. C., Lawrence, David J., Elphic, R. C., Gasnault, O. M., Maurice, S., Moore, K. R., and Binder, A. B. Mon . "Distribution of iron&titanium on the lunar surface from lunar prospector gamma ray spectra". United States. https://www.osti.gov/servlets/purl/975127.
@article{osti_975127,
title = {Distribution of iron&titanium on the lunar surface from lunar prospector gamma ray spectra},
author = {Prettyman, T. H. and Feldman, W. C. and Lawrence, David J. and Elphic, R. C. and Gasnault, O. M. and Maurice, S. and Moore, K. R. and Binder, A. B.},
abstractNote = {Gamma ray pulse height spectra acquired by the Lunar Prospector (LP) Gamma-Ray Spectrometer (GRS) contain information on the abundance of major elements in the lunar surface, including O, Si, Ti, Al, Fe, Mg, Ca, K, and Th. With the exception of Th and K, prompt gamma rays produced by cosmic ray interactions with surface materials are used to determine elemental abundance. Most of these gamma rays are produced by inelastic scattering of fast neutrons and by neutron capture. The production of neutron-induced gamma rays reaches a maximum deep below the surface (e.g. {approx}140 g/cm{sup 2} for inelastic scattering and {approx}50 g/cm{sup 2} for capture). Consequently, gamma rays sense the bulk composition of lunar materials, in contrast to optical methods [e.g. Clementine Spectral Reflectance (CSR)], which only sample the top few microns. Because most of the gamma rays are produced deep beneath the surface, few escape unscattered and the continuum of scattered gamma rays dominates the spectrum. In addition, due to the resolution of the spectrometer, there are few well-isolated peaks and peak fitting algorithms must be used to deconvolve the spectrum in order to determine the contribution of individual elements.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

Conference:
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