Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation.
Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability. The decomposition process is called radioactivity. The energy and particles which are released during the decomposition process are called radiation. When unstable nuclei decompose in nature, the process is referred to as natural radioactivity. When the unstable nuclei are prepared in the laboratory, the decomposition is called induced radioactivity.
Related Journals of Radioactivity
Fundamentals of Renewable Energy and Applications, Hydrogeology & Hydrologic Engineering, Environmental & Analytical Toxicology, Journal of Environmental Monitoring, Journal of Earth System Science, Journal of Radioanalytical and Nuclear Chemistry, Journal of Radiological Protection.