= Frédéric Joliot-Curie
{c}
{tag=Physicist}
{title2=1900–1958}
{wiki}
= Frédéric Joliot
{c}
{synonym}
<Frédéric Joliot> and <Irène Joliot-Curie> demonstrated that irradiation can create material that still exhibits <radioactivity> after the irradiating source is removed. In their 1934 report, <aluminium> exposed to a <polonium> source continued to emit <Positrons> afterward, with an exponentially decreasing count rate. Similar behavior in other light elements showed that irradiation had produced unstable nuclear species. Measuring the subsequent <radioactive decay> separated this persistent activity from radiation produced only during the incoming-particle collisions.<Artificial Production of a New Kind of Radio-Element by Frédéric Joliot and Irène Joliot-Curie>[1934 abstract, continued positron emission after removal of the polonium preparation]{ref}
A <physicist>.https://www.nobelprize.org/prizes/chemistry/1935/joliot-fred/biographical/?print=1[Independent professional biography and identity]{ref}
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{title=Portrait of <Frédéric Joliot-Curie>}
{description=Studio Harcourt / Wellcome Images, via Wikimedia Commons. https://creativecommons.org/licenses/by/4.0/[Creative Commons Attribution 4.0 International.], via Wikimedia Commons.}
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{width=250}
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