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Chinese Physics C> 2011, Vol. 35> Issue(8) : 735-740 DOI: 10.1088/1674-1137/35/8/007

Chemical composition of the lunar surface from neutron leakage fluxes

  • The neutron leakage fluxes from the lunar surface are calculated by Monte Carlo transport code based on Geant4. The integral fluxes of fast neutrons, epi-thermal neutrons and thermal neutrons are analyzed. Numerical results for 20 kinds of lunar soils and 7 minerals show that the fast neutron fluxes are linearly related to the average atomic mass numbers of the lunar materials used in simulations. Meanwhile, the average atomic mass numbers are strongly modulated by the abundances of iron (Fe) and titanium (Ti), and a linear relationship between the average atomic mass numbers and the abundances of Fe and Ti is found. Furthermore, the results show that the ratios of epi-thermal to thermal fluxes for lunar soils are linearly related to the macroscopic absorption cross sections of lunar materials, and that the macroscopic absorption cross sections monotonically increase with the abundances of Fe and Ti by a simple function. Then we reach the conclusion that the neutron fluxes can provide the information about the Fe and Ti contents.
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    [1] Evans L G, Reedy R C, Trombka J I. Introduction to Plane- tary Remote Sensing gamma Ray Spectroscopy. In: Pieters C M, Englert P A J ed. Remote Geochemical Analysis: Ele- mental and Mineralogical Composition. Camberidge: Cam- beridge Unversity Press, 1993. 1672 Feldman W C, Boynton W V, Drake D M. Planetary Neu- tron Spectroscopy from Orbit. In: Pieters C M and Englert P A J ed. Remote Geochemical Analysis: Elemental and Mineralogical Composition. Camberidge: Camberidge Un- versity Press, 1993. 2133 Feldman W C et al. Nucl. Instrum. Methods in Phys. Res. A, 1999, 422: 5624 Kobayashi S et al. Space Sci. Rev., 2010, 42: 3475 MA Tao et al. Advances in Space Research, 2008, 154: 1936 Feldman W C et al. Science, 2002, 297: 757 Mitrofanov I G et al. Planetary and Space Science, 2010, 58: 1168 Boynton W V et al. Science, 2002, 297: 819 Mitrofanov I G et al. Science, 2002, 297: 7810 Lawrence D J et al. Science, 1998, 281: 148411 Feldman W C et al. Science, 1998, 281: 148912 Feldman W C et al. Science, 1998, 281: 149613 Prettyman T H, Feldman W C, Titus T N. J. Geophys. Res., 2009, 114: E0800514 XU Shu-Yan. Monte Carlo Methods and Their Applica- tions to Experimental Nuclear Physics. (Revised). Beijing: Atomic Energy Press, 2006. 1 (in Chinese).15 https://mcnpx.lanl.gov/16 Agostinelli S et al. Nucl. Instrum. Methods in Phys. Res. A, 2003, 506: 25017 Lawrence D J et al. J. Geophys. Res., 2006, 111: E0800118 SONG Yu-Shou, YE Yan-Lin, GE Yu-Cheng et al. Chinese Physics C, 2009, 33: 86019 ZHANG Yi, ZHANG Xiao-Dong, WANG Wen-Xin et al. Chinese Physics C, 2009, 33: 4220 Serber R. Phys. Rev., 1947, 72: 111421 Feldman W C et al. J. Geophys. Res., 2000, 105(E8): 34722 Reedy R C. J. Geophys. Res., 1987, 92: E69723 Lucey P. Reviews in Mineralogy and Geochemistry, 2006, 60: 8324 Gasnault O et al. J. Geophys. Res., 2001, 28(19): 379725 Baum M, Knox H D, Miller T R. Chart of the Nuclides (Sixteen Edition), 2002. 40

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CHENG Yu, DONG Tie-Kuang, DONG Wu-Dong, REN Zhong-Zhou and XU Ao-Ao. Chemical composition of the lunar surface from neutron leakage fluxes[J]. Chinese Physics C, 2011, 35(8): 735-740. doi: 10.1088/1674-1137/35/8/007
CHENG Yu, DONG Tie-Kuang, DONG Wu-Dong, REN Zhong-Zhou and XU Ao-Ao. Chemical composition of the lunar surface from neutron leakage fluxes[J]. Chinese Physics C, 2011, 35(8): 735-740.  doi: 10.1088/1674-1137/35/8/007 shu
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Received: 2010-11-15
Revised: 1900-01-01
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Chemical composition of the lunar surface from neutron leakage fluxes

  • Received Date: 2010-11-15
  • Accepted Date: 1900-01-01
  • Available Online: 2011-08-05

Abstract: The neutron leakage fluxes from the lunar surface are calculated by Monte Carlo transport code based on Geant4. The integral fluxes of fast neutrons, epi-thermal neutrons and thermal neutrons are analyzed. Numerical results for 20 kinds of lunar soils and 7 minerals show that the fast neutron fluxes are linearly related to the average atomic mass numbers of the lunar materials used in simulations. Meanwhile, the average atomic mass numbers are strongly modulated by the abundances of iron (Fe) and titanium (Ti), and a linear relationship between the average atomic mass numbers and the abundances of Fe and Ti is found. Furthermore, the results show that the ratios of epi-thermal to thermal fluxes for lunar soils are linearly related to the macroscopic absorption cross sections of lunar materials, and that the macroscopic absorption cross sections monotonically increase with the abundances of Fe and Ti by a simple function. Then we reach the conclusion that the neutron fluxes can provide the information about the Fe and Ti contents.

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