# Problem: A patient is given 0.055 µg of technetium-99m, a radioactive isotope with a half-life of about 6.0 hours. How long does it take for the radioactive isotope to decay to 3.5×10−3 g ? (Assume no excretion of the nuclide from the body.)

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###### Problem Details

A patient is given 0.055 µg of technetium-99m, a radioactive isotope with a half-life of about 6.0 hours. How long does it take for the radioactive isotope to decay to 3.5×10−3 g ? (Assume no excretion of the nuclide from the body.)