Doctors can use radioactive chemicals to treat some forms of cancer. The half life of a certain chemical is 9 days. A patient receives a treatment of 28 millicuries of the chemical. (A millicurie is a unit of radioactivity.) How much of the chemical remains in the patient 18 days later?

Question

Doctors can use radioactive chemicals to treat some forms of cancer. The half life of a certain chemical is 9 days. A patient receives a treatment of 28 millicuries of the chemical.​ (A millicurie is a unit of ​ radioactivity.) How much of the chemical remains in the patient 18 days​ later?

likeabossssssss · Answer

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festinger · Answer

After 18 days, 2 half life durations would have passed. Thus, the activity remaining is
$$28*\frac{1}{2}*\frac{1}{2}=7mSv$$