Induced Radioactivity in Cadmium and Indium

Abstract

The artificial activation of cadmium and indium now yields at least three radioactive isotopes of cadmium and eight radioactive isotopes of indium. The probable masses of several of these isotopes have been determined. In cadmium bombarded with deuterons two chain reactions are observed in which the active cadmium decays to radioactive indium. These are Cd (56 hour) to In (4.5 hour), and Cd (3.75 hour) to In (2.1 hour). Evidence is presented for believing that a new 65-hour gamma-radiation is due to an excited state of a normally stable indium isotope of mass 113. The energies and decay constants of many of the radiations have been accurately measured by means of a magnetic spectrometer of high resolving power.