Technetium
The isotope 99mTc is used in nuclear medicine. It is used for many diagnostic tests. It has a short half-life. 99Tc is used as a source of beta particles without emitting gamma rays. The ion that has oxygen and technetium bonded together (TcO4-) is named the pertechnetate ion. The pertechnetate ion could be used as to prevent anodic corrosion in steel.