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 activation of stable cadmium isotopes. It has a relatively long half-life of 14.2 years, during which it decays primarily through isomeric transition to cadmium-113. This decay process emits gamma rays. In some cases, it can also decay by beta emission to indium-113.

Due to its radioactive nature and the emission of gamma rays, cadmium-113m is considered a radiological hazard. Its presence is monitored in nuclear fuel cycles and in environments potentially contaminated by nuclear activities. Applications are limited due to its radioactivity, though its decay properties have been studied in nuclear physics research. Exposure can occur through inhalation or ingestion of contaminated materials, and appropriate shielding and containment measures are necessary when handling this isotope.