Abstract
AN extensive series of investigations by Dalton and co-workers1,2 using fluorimetric and radon-counting techniques has indicated that the uranium content of many iron meteorites lies in the range 20–100 × 10−10 gm./gm. This supports an age of only a few hundred million years for some of these meteorites, and implies a distribution coefficient of only about one hundred for a very electropositive element between the silicate and metal phases of planets3.
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