million years to over 4 5 billion years with precision in the 0 1 1 range The U Pb dating method relies on two separate decay

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million years to over 4 5 billion years with precision in the 0 1 1 range The U Pb dating method relies on two separate decay chains one of which is the actinium series from 235U to 207Pb with a half life of 704 million years V 2nd attempt See Periodic Table See Hint Geologists unearth a sample of zircon that appears to be a closed system They find 0 730 grams of 207 Pb for 1 000 grams of 235 U present Approximately how old is the sample

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