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Davis & Bielefeld 1981
Davis, P.A. and Bielefeld, M.J. (1981). Inelastic neutron scatter iron concentrations of the moon from orbital gamma ray data. Journal of Geophysical Research 86: doi: 10.1029/JB080i012p11919. issn: 0148-0227.

A set of regional Fe values were obtained from the inelastic scatter peak of the Apollo 15 and 16 orbital gamma ray spectra. These Fe(n,n'&ggr;) values were determined from a reaction that does not depend upon thermal neutrons and should therefore be a test of thermal neutron flux depression. No consistent effects of thermal neutron flux depression are apparent. The majority of the higher energy Fe (n,&ggr;) values are substantiated by the Fe (n,n'&ggr;) results: differences of more than one sigma between iron (n,n'&ggr;) values and Fe (n,&ggr;) values are attributed to the difficulty in stripping the variation in natural radioactivity from the inelastic scatter Fe band. The Fe (n,&ggr;) data set is, therefore, shown to be reliable and to reflect the actual Fe variation on the lunar surface.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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