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Title: THE FIRST LUNAR MAP OF THE AVERAGE SOIL ATOMIC MASS

Measurements of indexes of lunar surface composition were successfully made during Lunar Prospector (LP) mission, using the Neutron Spectrometers (NS) [1]. This capability is demonstrated for fast neutrons in Plates 1 of Maurice et al. [2] (similar to Figure 2 here). Inspection shows a clear distinction between mare basalt (bright) and highland terranes [2]. Fast neutron simulations demonstrate the sensitivity of the fast neutron leakage flux to the presence of iron and titanium in the soil [3]. The dependence of the flux to a third element (calcium or aluminum) was also suspected [4]. We expand our previous work in this study by estimating fast neutron leakage fluxes for a more comprehensive set of assumed lunar compositions. We find a strong relationship between the fast neutron fluxes and the average soil atomic mass: <A>. This relation can be inverted to provide a map of <A> from the measured map of fast neutrons from the Moon.
Authors:
; ;
Publication Date:
OSTI Identifier:
773346
Report Number(s):
LA-UR-01-250
TRN: AH200123%%48
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Jan 2001
Research Org:
Los Alamos National Lab., NM (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM; BASALT; CALCIUM; FAST NEUTRONS; IRON; MOON; NEUTRON SPECTROMETERS; SENSITIVITY; SOILS; TITANIUM; MAPS; GEOCHEMISTRY