Radioactive Isotopes

Radioactive isotopes can sometimes emit or radiation, which can be very dangerous to people. However, they can be very useful for medical purposes, so long as the proper quantity is used. If the safety standard for a radioactive injection of phosphorus requires that less than 0.01g remains in the body after 90 days after the injection, what is the maximum initial dose? The half-life of phosphorous is 14.29 days.

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