Abstract
Using a stepwise dissolution technique argon-39 decay rates were determined in three different mineral fractions of the enstatite chondrite Abee. As the ratios FeNi:Ca:K were highly different, the production rates on these elements could be determined; they were found to be (21.0 ± 1.0), (60 ± 30) and (7450 ± 500) dpm/kg on FeNi, Ca, and K, respectively. Hence, in meteorites with a chondritic Ca/K-ratio the argon-39 in excess of that to be expected from reactions on iron and nickel alone, is almost entirely due to the (n,p) reaction on potassium-39.The average neutron flux (E ≳ 1.5 MeV) in Abee during the last 400 years was φ ≈ 60 neutrons per cm2 and sec. Evidence is presented that in different stone meteorites this flux differs by at least a factor of ten, that in Abee being on the high side.
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