U238 has a very long half life and decays through a series of daughter products ending with a stable isotope of lead. Very old samples of U ore, which have not_ undergone physical or chemical changes, would be expected to show an equilibrium between the daughter elements provided that their half life was considerably shorten than that of U. Analysis of an ore of U8 shows that for each 1.00 g of U38 238 238 92 92 92 there is 0.300 µgo Ra 226 . The half life of Ra is 1602 years. 226 88 8, What is the half life of U38 ? 92

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