Plutonium-240

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What Wikipedia says

Plutonium-240 (240Pu or Pu-240) is an isotope of plutonium formed when plutonium-239 captures a neutron without undergoing fission. The detection of its spontaneous fission led to its discovery in 1944 at Los Alamos and had important consequences for the Manhattan Project.

Excerpt from the Wikipedia article “Plutonium-240”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: SM358, Public domain, via Wikimedia Commons.