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. |