The unique cosmic-ray history of the Malakal chondrite

Details The unique cosmic-ray history of the Malakal chondrite The unique cosmic-ray history of the Malakal chondrite

Jun 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..22..275c&link_type=abstract

Earth and Planetary Science Letters, vol. 22, Issue 3, pp.275-283

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Scientific paper

Cosmogenic radionuclides, including 22 Na, 26 Al and 54 Mn, were measured in a sample of the recently-fallen Malakal hypersthene chondrite. The high 26 Al activity, 79 ± 2 dpm/kg, greatly exceeds the levels expected from elemental production rates, shielding considerations, or comparisons with other ordinary chondrites, and can only be explained by exposure to a uniquely high cosmic-ray flux. Calculations including noble gas, 3 H, and 53 Mn data from other laboratories require a two-stage irradiation. Malakal's most probable history is: exposure in excess of 4 m.y. to an effective cosmic-ray flux approximately three times that experienced by other chondrites, an orbit change (very possibly caused by a collision), and a final period of about 2 m.y. during which it was exposed to a "normal" cosmic-ray flux.

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