The radioactive Polonium-210 decays to half its original amount every 139 days. If your sample will not be useful to you after 72% of the radioactive nuclei present on the day the sample arrives had disintegrated, for about how many days after the sample arrives wil you be able to use your polonium sample.

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.