Accession Number : AD0267992

Title :   CHLORINE 36 AS SPALLATION PRODUCT OF THE COSMIC RAYS IN METEORITES AND THE EXPOSURE AGE OF IRON METEORITES.

Corporate Author : MAX-PLANCK-INSTITUT FUER CHEMIE MAINZ (WEST GERMANY)

Personal Author(s) : VILCSEK,E. ; WANKE,H.

Report Date : 01 MAR 1961

Pagination or Media Count : 20

Abstract : Chlorine 36, which is produced by the interaction of cosmic ray particles with the nuclei of the meteorites, was measured in seven iron meteorites and in one stone meteorite. The decay rates for chlorine 36 in iron meteorites varied between 6.5 and 20.2 dpm/kg. The chlorine 36 values together with the concentration of stable spallation products allowed us to calculate the exposure ages of these meteorites. By this way we found for six of the meteorites examined exposure ages close to 500 million years. Only for the Sikhote Alin meteorite the quite different exposure age of 60 million years was measured. As this value is also definitely lower than that found by other authors for this meteorite, it is suggested that the Sikhote Alin had been part of a bigger meteorite which was broken into pieces about 60 million years ago by a collision with another meteorite. (Author)

Descriptors :   *CHLORINE, *METEORITES, *PENTABORANES, *SPALLATION, BETA DECAY, EXPERIMENTAL DATA, NUCLEI, PARTICLES, RADIOACTIVE DECAY, RADIOACTIVE ISOTOPES, TABLES(DATA)

Distribution Statement : APPROVED FOR PUBLIC RELEASE