This Day in History

Demon Core Goes Critical (1945)
The Demon Core was a plutonium core—used in nuclear testing at the Los Alamos National Laboratory in New Mexico—so nicknamed because it resulted in the deaths of two scientists in separate accidents. In 1945, Harry Daghlian accidentally dropped a tungsten carbide brick onto the core, causing it to go "critical," or achieve a chain reaction of nuclear fission. Daghlian stopped the reaction, but died from radiation poisoning a month later. What happened to the second scientist nine months later? Discuss

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