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Chemistry, 03.12.2021 01:00 selena827

one of the decay products of 238u is 226ra . a rock originally contained 238u , which has a half-life of 4.5×109 yr, and 226ra , which has a half-life of 1,600 yr. after 5×109 yr, which isotopes would you expect to be present in significant amounts in the rock?

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