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On this day, August 21, 1945, physicist Harry Daghlian was fatally irradiated at Los Alamos.
https://en.wikipedia.org/wiki/August_21• 1945 – Physicist Harry Daghlian is fatally irradiated in a criticality accident during an experiment with the Demon core at Los Alamos National Laboratory.
Mon Aug 21, 2023: On this day, August 21, 1945, physicist Harry Daghlian was fatally irradiated at Los Alamos.
https://en.wikipedia.org/wiki/Main_Page
• 1945 – American physicist Harry Daghlian accidentally dropped a tungsten carbide brick onto a plutonium bomb core, exposing himself to neutron radiation and later becoming the first Manhattan Project fatality due to a criticality accident.