Artificial Production of a New Kind of Radio-Element

@article{Joliot1934ArtificialPO,
  title={Artificial Production of a New Kind of Radio-Element},
  author={Fr{\'e}d{\'e}ric Joliot and Irene Curie},
  journal={Nature},
  year={1934},
  volume={133},
  pages={201-202}
}
SOME months ago we discovered that certain light elements emit positrons under the action of α-particles1. Our latest experiments have shown a very striking fact: when an aluminium foil is irradiated on a polonium preparation, the emission of positrons does not cease immediately, when the active preparation is removed. The foil remains radioactive and the emission of radiation decays exponentially as for an ordinary radio-element. We observed the same phenomenon with boron and magnesium2. The… 
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