Chemical composition of the lunar surface from neutron leakage fluxes

CHENG Yu; DONG Tie-Kuang; DONG Wu-Dong; REN Zhong-Zhou; XU Ao-Ao

doi:10.1088/1674-1137/35/8/007

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

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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.

References

[1]

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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

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Received: 2010-11-15
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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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Chemical composition of the lunar surface from neutron leakage fluxes

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