111Cd

111Cd is an isotope of cadmium. Cadmium is a chemical element with the symbol Cd and atomic number 48. It is a soft, silvery-white metal that is toxic and has a number of industrial uses. Isotopes are variants of a particular chemical element which differ in neutron number, and thus in nucleon number. 111Cd has 48 protons and 63 neutrons.

The isotope 111Cd is primarily known for its radioactive properties. It is a beta-minus emitter and decays into 111In with a half-life of 89.8 minutes. However, it also has a metastable nuclear isomer, 111mCd, which decays by isomeric transition and electron capture to 111Cd. This transition is often accompanied by the emission of gamma rays, which makes 111mCd useful in certain scientific and medical applications.

Specifically, the decay of 111mCd to 111Cd is used in the technique of Mössbauer spectroscopy. This technique allows for the study of the electronic environment of atoms within a material. The gamma rays emitted during the decay of 111mCd have specific energies that can be absorbed and re-emitted by other cadmium-containing samples, providing information about their atomic structure and magnetic properties. While 111Cd itself is not typically the focus of this application, its formation from the decay of 111mCd is integral to the process.