Identification of Pu 244 fission tracks and the cooling of the parent body of the Toluca meteorite

Details Identification of Pu 244 fission tracks and the cooling of the parent body of the Toluca meteorite Identification of Pu 244 fission tracks and the cooling of the parent body of the Toluca meteorite

Jan 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32...21f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 32, Issue 1, pp.21-31

Physics

16

Scientific paper

Fossil nuclear fission tracks have been studied in three silicate minerals from inclusions in the iron meteorite Toluca. If most of these tracks are assumed to be due to Pu 244 , their densities relative to those from U 238 spontaneous fission give measures of the time intervals between the end of production of heavy elements that were condensed in the solar system and the times when the minerals reached temperatures below which fission tracks are permanently stored. These time intervals, together with track stability data, allow a cooling rate to bo calculated of 1.1( -0.5 +0.6 ) °K/million yr through the temperature interval 500-900°K, 4.6 billion yr ago. This cooling rate agrees with that previously inferred by a totally different technique. The fission tracks are thus concluded to be due to Pu 244 , the only known spontaneously fissioning isotope which would yield the observed concordant cooling rate.

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