Apatient is administered 20 mg of iodine-131. how much of this isotope will remain in the body after 40 days if the half-life for iodine-131 is 8 days?

The formula for half-life is:

Where A is the amount of iodine-131 initially and after 40 days, t is time, h is half-life of the isotope.  Let's plug in our values to the equation:

Therefore, the patient has 0.625 grams of iodine-131 after 40 days.

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