Abstract
The Ar40, Ar36, and K41 contents of several iron meteorites have been measured by neutron activation analysis. The data are in agreement with previous results which were interpreted as measuring a K40-Ar40 age. The possible effects of cosmic rays, primordial rare gases, and atmospheric gas diffusion were also investigated. These results are not in disagreement with an ‘age’ interpretation; however, the nonconstancy of the K40/Ar40 ratio within the Santa Rosa meteorite argues against this interpretation. The origin of the Ar40 in iron meteorites is not presently resolved.
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