April 30, 2020 Radioactivity is the process by which an atom or molecule emits energy in the form of radiation. It is a natural phenomenon that occurs in all elements and is a result of their unstable nuclei. Radioactivity can be used in a variety of ways, from medical treatments to energy production. It is also a major concern when it comes to nuclear accidents or disasters. In this section, you will find a selection of news, articles and videos about radioactivity and its various applications.