Harry Daghlian

Harry Daghlian
Daghlian c. 1944
Born
Haroutune Krikor Daghlian Jr.

(1921-05-04)May 4, 1921
DiedSeptember 15, 1945(1945-09-15) (aged 24)
Cause of deathAcute radiation syndrome
Resting placeCedar Grove Cemetery
EducationMassachusetts Institute of Technology
Purdue University (BS)
OccupationPhysicist
Herbert Lehr (left) and Harry Daghlian Jr. (right), loading the assembled tamper plug containing the plutonium pit and initiator into a car for transport from the McDonald ranch house to the shot tower on July 13, 1945.

Haroutune Krikor Daghlian Jr. (May 4, 1921 – September 15, 1945) was an American physicist with the Manhattan Project, which designed and produced the atomic bombs that were used in World War II. He accidentally irradiated himself on August 21, 1945, during a critical mass experiment at the remote Omega Site of the Los Alamos Laboratory in New Mexico and died 25 days later from the resultant radiation poisoning.

Daghlian was irradiated as a result of a criticality accident that occurred when he accidentally dropped a tungsten carbide brick onto a 6.2 kg bomb core made of plutonium–gallium alloy. This core, subsequently nicknamed the "demon core", was later involved in the death of another physicist, Louis Slotin.