Question: Louis Alexander Slotin, was a Canadian physicist and chemist who worked on the Manhattan Project, Slotin was the second person to die from a criticality accident, following the death of Harry Daghlian, who had been exposed to what?
Sentence (from "Louis Slotin"): On 21 May 1946, Slotin was conducting a demonstration when he accidentally initiated a fission reaction, which released a burst of hard radiation.
Relevant evidence: No