Internal conversion refers to the process in which an excited nucleus rapidly releases energy without emitting a photon, usually resulting in a change in the nuclear spin. Synonyms for internal conversion include internal transition, non-radiative transition, and non-emissive decay. These terms are commonly used in the field of nuclear physics to describe the different types of energy releases that can occur within an excited nucleus. Understanding the mechanisms of internal conversion is essential in the study of nuclear reactions and the development of practical applications such as imaging and radiation therapy. By exploring the related synonyms, scientists can better grasp the complexity of this important process and its many potential applications.