SOLUTION: The radioactive isotope technetium 99m is used in imaging the brain. The isotope has a half-life of 6 hours. If 12 milligrams are used, how much will be present after 10 hours?

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Question 1149489: The radioactive isotope technetium 99m is used in imaging the brain. The isotope has a half-life of 6 hours. If 12 milligrams are used, how much will be present after 10 hours?
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


The amount remaining is the original amount, multiplied by 0.5 raised to the number that is the number of half-lives.

The given half-life is 6 hours; the given time is 10 hours. That is 10/6 = 5/3 half-lives. So

12%280.5%29%5E%285%2F3%29

Use a calculator....