As a general rule, the radioactivity from a particular radioisotope is considered to be reduced to a safe level after 10 half-lives have elapsed. (Obviously, the initial quantity of the isotope is also important.)
a) By how much is the rate of emission of radiation reduced after 10 half-lives?
b) Plutonium-239 is considered to be one of the most dangerous radioisotopes. Its half-life is about 25,000 years. How long would a sample of plutonium-239 have to be kept isolated before it could be considered safe?
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