![]() ![]() After 24 hours, the radioactivity from the procedure will be reduced by more than 90%. The short half-life of technetium-99m helps keep the dose to the patient low.For example, technetium-99m, one of the most common medical isotopes used for imaging studies, has a half-life of 6 hours.Radionuclides used in nuclear medicine procedures, have short half-lives. A good rule of thumb is that, after seven half-lives, you will have less than one percent of the original amount of radiation.Ĭlick here for a closer look at half life.ĭepending on the radionuclide, this process could be fast or take a very long time – radioactive half-lives can range from milliseconds to hours, days, sometimes millions of years. Half-life is the length of time it takes for half of the radioactive atoms of a specific radionuclide to decay. Another feature of each radionuclide is its half-life. ![]()
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