Artificial radioactivity

Artificial radioactivity involved bombarding aluminum atoms with alpha particles to produce radioactive phosphorus-30 and silicon-30. This discovery demonstrated that stable elements could be converted into radioactive isotopes, known as radioisotopes.
 Frédéric and Irène Joliot-Curie France 1934 Artificial radioactivity

Artificial radioactivity involved bombarding aluminum atoms with alpha particles to produce radioactive phosphorus-30 and silicon-30. This discovery demonstrated that stable elements could be converted into radioactive isotopes, known as radioisotopes.