the-radioactivity-in-soil-that-comes-from-the-decay-of-uranium-isotopes-is-686-p

Question

The radioactivity in a soil sample that comes from the decay of uranium isotopes is 662 pCi/mg. Calculate the number of disintegrations in 1 mg of soil in 1 hour. Assuming that the major radioisotope is ²³⁸U (t_1/2 = 4.468×10⁹ y), how many ²³⁸U atoms are there in 2.5 mg of soil?

Accepted Answer

88.2 disintegrations
4.98×10¹⁵ ²³⁸U atoms

Answer

912 disintegrations
1.45×10¹⁷ ²³⁸U atoms

Answer

79.1 disintegrations
2.68×10¹⁶ ²³⁸U atoms

Answer

8.14 disintegrations
3.10×10¹⁷ ²³⁸U atoms

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The radioactivity in a soil sample that comes from the decay of uranium isotopes is 662 pCi/mg. Calculate the number of disintegrations in 1 mg of soil in 1 hour. Assuming that the major radioisotope is ²³⁸U (t_1/2 = 4.468×10⁹ y), how many ²³⁸U atoms are there in 2.5 mg of soil?

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The radioactivity in a soil sample that comes from the decay of uranium isotopes is 662 pCi/mg. Calculate the number of disintegrations in 1 mg of soil in 1 hour. Assuming that the major radioisotope is 238U (t1/2 = 4.468×109 y), how many 238U atoms are there in 2.5 mg of soil?

The radioactivity in a soil sample that comes from the decay of uranium isotopes is 662 pCi/mg. Calculate the number of disintegrations in 1 mg of soil in 1 hour. Assuming that the major radioisotope is ²³⁸U (t_1/2 = 4.468×10⁹ y), how many ²³⁸U atoms are there in 2.5 mg of soil?