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MASS SPECTROMETRIC MEASUREMENT OF THE ISOTOPIC FREQUENCY OF POTASSIUM FROM IRON METEORITES AND THE PROBLEMS OF THE DETERMINATION OF THE K$sup 41$ -K$sup 40$ RADIATION AGE (in German)

Journal Article · · Zeitschrift fuer Naturforschung (West Germany) Divided into Z. Nautrforsch., A, and Z. Naturforsch., B: Anorg. Chem., Org. Chem., Biochem., Biophys.,
OSTI ID:4802034
;
In 11 iron meteorites the isotopic abundances of potassium were measured. For some meteorites mass spectra of essentially potassium were obtained for example, from Aroos K/sup 39/ 42.0%; K/sup 40/ 18.9%; K/sup 41/ 39.1%. In other meteorites (e.g. Lombard K/sup 39/88.0%, K/sup 40/ 2.1%, K/sup 41/ 9.9%) the primordial potassium predominates. From thc isotopic abundances, the radiation ages of the iron meteorites were calculated from two different approaches: in the first case under the assumption that the potassium isotopes were produced in the same proportion in all meteorites; in the second case it was assumed that the energv spectrum of the radiation and hence the production ratios of the potassium isotopes differed from meteorite to meteorite. The He/Neratios in the meteorites were taken to be characteristic of the nature of the energy spectrum. Since the relationship between the He/Ne ratio and the production ratios for the potassium isotopes is not yet well known the calculated radiation ages are probably only approximately correct. They vary between 1400 x 10/sup 6/ years (Clark County) and 200 x 10/sup 6/ years (Lombard). (auth)
Research Organization:
Max-Planck-Institut fur Chemie, Mainz
NSA Number:
NSA-16-010750
OSTI ID:
4802034
Journal Information:
Zeitschrift fuer Naturforschung (West Germany) Divided into Z. Nautrforsch., A, and Z. Naturforsch., B: Anorg. Chem., Org. Chem., Biochem., Biophys.,, Journal Name: Zeitschrift fuer Naturforschung (West Germany) Divided into Z. Nautrforsch., A, and Z. Naturforsch., B: Anorg. Chem., Org. Chem., Biochem., Biophys., Vol. Vol: 16a; ISSN ZNTFA
Country of Publication:
Country unknown/Code not available
Language:
German

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Related Subjects

AGE
ENERGY
HELIUM
IRON
IRRADIATION
MASS SPECTROMETERS
MEASURED VALUES
METEORITES
NEON
PHYSICS
POTASSIUM ISOTOPES
PRODUCTION
QUANTITY RATIO
RADIATIONS
SPECTRA