Computer Science
Scientific paper
Jan 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..18...72f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 18, Issue 1-2, pp.72-74
Computer Science
3
Scientific paper
The rare gases He, Ne and Ar and their isotopic composition were investigated in the iron meteorite Treysa. The meteorite showed a He 4 -content of ~21 × 10 -6 cm 3 /g, an Ar 36 -content of ~15 × 10 -8 cm 3 / g and a Ne-content of ~6 × 10 -8 cm 3 /g. In dependence of depth the isotopic ratio of Ar 38 / Ar 36 and He 4 / He 3 varied about 20% in the investigated disk. This variation of the isotopic ratio may be qualitatively explained by the results of spallation investigations on copper with 0.34 and 2.2 GeV protons and on steel with 0.16, 0.43 and 3.0 GeV protons. Assuming the ratio of the average post-atmospheric radius to the average pre-atmospheric radius of Treysa is 0.44 and the spectrum of the cosmic radiation extends down to 500 MeV, we found by calculation that the variation of the Ar 38 / Ar 36 -ratio will be caused only by the primary component. The variation of the He 4 / He 3 -ratio is presumably a consequence of a secondary radiation. The amount of Ar 38 found in the disk allowed us to calculate a radiation age of ~10 9 years.
Fechtig Hugo
Gentner W.
Kistner G.
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