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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Some cosmic ray produced radioactivities in the Norton County achondrite and the Peace River chondrite

Hideki Matsuda, Kinuko Horie, Masatake Honda
Geochemical Journal, Vol. 2, No. 3-4, P. 167-174, 1968


Activities of two cosmic ray produced radionuclides, 11Be and 26Al, were determined for the Norton County achondrite. 11Be, 22Na, 26Al, 44Ti, 53Mn and 60Co were determined for the Peace River chondrite. Except for 10Be and 53Mn, these activities were measured employing a low level β-γ coincidence method. Combining these data with those reported for stable rare gases, the radiation age of Norton County was calculated to be (120±20) × 106 y which is significantly lower than previous estimations by a factor ranging from 2 to 5. The results for Peace River were compared with other experiments which appeared in literature, and the shielding effect was discussed.

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