Question

While Tc-99m has a half-life of 6.01 hours, its decay product has a half-life of 213,000 years.  While the medical community considers it to be reasonably safe, within the limits of testing, does this make sense considering both chemical and biological principles?

Answer 1

Yes, it is safe because it doesn't not stay in the body long because it's half life is just 6 hrs. Radioactive nuclei leaves the body when it has not yet considerably decayed.Due to this, it has not given up any activity.