title: Apollo 12 lunar samples: trace element analysis of a core and the uniformity of the regolith.
abstract: Four core and soil samples from Apollo 12 are enriched in a number of trace elements of meteoritic origin to virtually the same degree as Apollo 11 soil. An average meteoritic influx rate of about 4 x 10(-9) gram per square centimeter per year thus seems to be valid for the entire moon. A sample from a light gray, coarse-grained layer in the core resembles lunar basalts in composition, but is enriched by factors of 10(4) to 10(5) in bismuth and cadmium.
authors.forename: R
authors.initials: R
authors.lastname: Ganapathy
authors.forename: R R
authors.initials: RR
authors.lastname: Keays
authors.forename: E
authors.initials: E
authors.lastname: Anders