Technetium-99m is used for a number of diagnostic purposes in medicine. For example, 99mTc introduced into the bloodstream is not normally absorbed by brain cells, but it is absorbed by a tumor. A brain scan can locate the tumor. If a sample of 99mTc is introduced into a body in this way, and 6.25% of its radioactivity remains after 24 h, what is the half-life of 99mTc?
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