1934 and the discovery of artificial radioisotopes
Most of radioactive nuclei have vanished from earth, but some have been recreated by man. In the beginning of 1934, Irène and Frédéric Joliot-Curie produced in their laboratory a radioactive atom of phosphorus which didn’t exist in nature by bombarding a sheet of aluminium by alpha particles. This phosphorus atom disintegrated like a natural radioactive element. Because of its numerous applications, particularly medical, the discovery of artificial radioactivity had an enormous impact. Its importance was quickly recognized. In 1935, Irène and Frédéric Joliot-Curie were awarded the Nobel Prize.
ACJC (AssociationCurie/Joliot-Curie)