Aluminum-26 in meteorites--VII. Ureilites, their unique radiation history

Details Aluminum-26 in meteorites--VII. Ureilites, their unique radiation history Aluminum-26 in meteorites--VII. Ureilites, their unique radiation history

Jul 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.1803w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 7, pp.1803-1810

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Scientific paper

Cosmogenic 26 A1 activities have been measured by - coincidence counting in the three ureilites which had not previously been studied. The values in dpm/kg are: Dingo Pup Donga, 38.4 ± 2.4; North Haig, 39.3 ± 4.8; Dyalpur, 55.8 ± 4.8. Five of the six known ureilites thus have lower 26 A1 contents, 63 per cent to 77 per cent, than the calculated saturation values, in marked contrast to most other stony meteorites. This cannot be attributed to short cosmic ray exposure ages. Nor do size and depth effects account for the narrow range of 26 A1 activities, because a nuclear particle track study indicates that preatmospheric radii were highly variable, from 40 cm for Goalpara to only a few cm for Dingo Pup Donga. By default, the most likely explanation is that the ureilites had much smaller or much larger orbits than all other stony meteorites.

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