Artificial Production of a New Kind of Radio-Element

  title={Artificial Production of a New Kind of Radio-Element},
  author={Fr{\'e}d{\'e}ric Joliot and Irene Curie},
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… 
Induced Radioactivity of the Lighter Elements
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Induced Radioactivity of Fluorine and Calcium
IN an earlier paper1, I have shown that sodium and phosphorus become radioactive under bombardment with alpha rays, presumably corresponding to the creation of Al26 and Cl34 respectively. In the case
The Period of Radionitrogen
IN their first communication on induced radioactivity, Curie and Joliot1 reported that a radioactive isotope of nitrogen was formed from boron by bombardment with α-rays according to the scheme: The
Induced Radioactivity of Sodium and Phosphorus
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Fast-neutron production of radioisotopes
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Energy Spectrum of Positive Electrons ejected by Radioactive Nitrogen
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Discovery of Radioactivity
The possible discovery of neutron activation in 1910
One-hundred-two years ago, on 21 April 1910, the Austrian chemist Carl Auer von Welsbach published a short comment on a fundamental discovery he had made in the field of nuclear sciences. He reported
Technetium, the missing element
The history of the discovered technetium is reviewed within the framework of the discovery and production of artificial radioactivity in the twentieth century and a detailed account is given of the steps taken.
The Discovery of Artificial Radioactivity
We reconstruct Frédéric Joliot and Irène Curie’s discovery of artificial radioactivity in January 1934 based in part on documents preserved in the Joliot–Curie Archives in Paris, France. We argue