In 1896, Henri Becquerel first discovered natural radioactivity in potassium uranyl sulfate. Artificial radioactivity was not produced until 1934, when I. Curie and F. Joliot made boron, aluminum, and magnesium radioactive by bombarding them with a particles from polonium. This introduction of artificial radioactivity prompted the invention of cyclotrons and reactors in which many radionuclides are now produced. So far, more than 2700 radionuclides have been artificially produced and characterized in terms of their physical properties.
KeywordsElectron Capture Auger Electron Isomeric State Internal Conversion Decay Scheme
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