Cadmium113m
Cadmium-113m is a radioactive isotope of cadmium. Its nucleus contains 48 protons and 65 neutrons. The 'm' in its designation signifies that it is a metastable isomer, meaning it exists in a higher energy state and will eventually decay to a lower energy state.
Cadmium-113m is produced as a fission product in nuclear reactors and can also be formed through neutron
Due to its radioactive nature and the emission of gamma rays, cadmium-113m is considered a radiological hazard.