28 Isotopes and radioactivity 5 Suppose that 1 mg of purified uranium has been isolated. It contains two (main) isotopes 238 and 235U in the
28 Isotopes and radioactivity 5 Suppose that 1 mg of purified uranium has been isolated. It contains two (main) isotopes 238 and 235U in the current proportions of 2380/2U =137.8. What was the total activity of this milligram of uranium 4.5 billion years ago and what is its activity today if /238 - 0.155 125 . 10 ' yr ! and /235 = 0.9875 . 10 9 yr- 17
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