21. Nuclear Chemistry
Radioactive Half-Life
6PRACTICE PROBLEM
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 (t1/2 = 4.468×109 y), how many 238U atoms are there in 2.5 mg of soil?