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. u-238 has a half-life of 4.468 x 109 years. estimates of the age of the universe range from 9 x 109 years to 23 x 109 years. what fraction of this isotope present at the start of the universe remains today

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. u-238 has a half-life of 4.468 x 109 years. estimates of the age of the universe range from 9 x 109 years to 23 x 109 years. what fraction of this isotope present at the start of the universe remains today