Abstract
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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