title: Major and trace elements and cosmic-ray produced radioisotopes in lunar samples.
abstract: Analytical data for 42 major and trace elements were mostly obtained by a combination of instrumental and radiochemical neutron activation analyses using both thermal and 14-million-electronvolt neutrons. Excesses of nitrogen and chlorine in the fines, compared with the rocks, are attributed to the solar wind. A striking similarity for contents of seven elements in lunar metal and metal from the calcium-rich achondrite Juvinas was noted. Fractional dissolution was used to separate five radionuclides produced by cosmic-ray bombardment in the fines and rock 57-40. Results for argon-39 from the reaction potassium-39 (n,p), and for argon-37, from the reaction calcium-40 (n,a), seem to require a neutron spectrum conitaining more neutrons below 2 million electronvolts than the evaporation spectrum or that given by Arnold, Honda, and Lal (1) or a strong time dependence for the neutron flux.
authors.forename: H
authors.initials: H
authors.lastname: Wänke
authors.forename: F
authors.initials: F
authors.lastname: Begemann
authors.forename: E
authors.initials: E
authors.lastname: Vilcsek
authors.forename: R
authors.initials: R
authors.lastname: Rieder
authors.forename: F
authors.initials: F
authors.lastname: Teschke
authors.forename: W
authors.initials: W
authors.lastname: Born
authors.forename: M
authors.initials: M
authors.lastname: Quijano-Rico
authors.forename: H
authors.initials: H
authors.lastname: Voshage
authors.forename: F
authors.initials: F
authors.lastname: Wlotzka