title: Fossil Particle Tracks and Uranium Distributions in Minerals of the Vaca Muerta Meteorite.
abstract: Fossil tracks of charged particles have been observed in minerals separated from the Vaca Muerta mesosiderite. Irradiation of samples of the meteorite with thermal neutrons in a nuclear reactor, together with measurements of track-length distribution, indicate that some of the tracks result from the spontaneous fission of uranium impurities; others, however, are of different origin. Uranium concentrations, which ranged from about 4000 parts per million in a zircon grain to less than 10(-3) parts per million in hypersthene and anorthite, were also measured by irradiating samples with thermal neutrons.
authors.forename: R L
authors.initials: RL
authors.lastname: Fleischer
authors.forename: C W
authors.initials: CW
authors.lastname: Naeser
authors.forename: P B
authors.initials: PB
authors.lastname: Price
authors.forename: R M
authors.initials: RM
authors.lastname: Walker
authors.forename: U B
authors.initials: UB
authors.lastname: Marvin