residual radioactive material following a nuclear blast
One of many possible fallout patterns mapped by the United States Federal Emergency Management Agency that could occur during a nuclear war (based on 1988 data). Atmospheric nuclear weapon tests almost doubled the concentration of radioactive C in the Northern Hemisphere called the bomb pulse, before levels slowly declined following the Partial Test Ban Treaty.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).