Also known as Pu-240, 240Pu, Plutonium 240
Plutonium-240 (' 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.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).