I. Un nouveau type de radioactivité. II. Séparation chimique des nouveaux radioéléments émetteur d’électrons positifs.

Discovery of artificially produced radionuclides or radioisotopes. In February 1934, the Joliot-Curies reported the first artificial production of radioactive material after discovering radioactivity in aluminum foil that was irradiated with a polonium preparation." Also published in English as "Artificial production of a new kind of radioelement," Nature, 133 (1934) 201.

In 1935 Frédéric Joliot and Irène Joliot-Curie shared the Nobel Prize in Chemistry "in recognition of their synthesis of new radioactive elements."