Harry Daghlian

E726893

Manhattan Project scientist human physicist

Harry Daghlian was an American physicist and Manhattan Project researcher who died from acute radiation poisoning after a criticality accident involving the plutonium "demon core" in 1945.

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All labels observed (1)

Label	Occurrences
Harry Daghlian canonical	2

How this entity was disambiguated

This entity first appeared as the object of triple T8246501 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Harry Daghlian
Context triple: [demon core, causedDeathOf, Harry Daghlian]

A. Louis Slotin
Louis Slotin was a Canadian physicist and chemist best known for his work on the Manhattan Project and for a fatal criticality accident during a plutonium core experiment in 1946.
B. John Plamenatz
John Plamenatz was a prominent 20th-century political philosopher, best known for his influential work on political obligation, liberalism, and the interpretation of classic political theorists.
C. Adam Ulam
Adam Ulam was a prominent Polish-American historian and political scientist known for his influential scholarship on Soviet history and foreign policy.
D. Robert Serber
Robert Serber was an American theoretical physicist best known for his key role in the Manhattan Project, where he helped design the first nuclear weapons and authored the influential "Los Alamos Primer" lectures.
E. Alvin M. Weinberg
Alvin M. Weinberg was an American nuclear physicist and long-time director of Oak Ridge National Laboratory, best known for his pioneering work on nuclear reactor design and advocacy for safe, peaceful uses of nuclear energy.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Harry Daghlian
Target entity description: Harry Daghlian was an American physicist and Manhattan Project researcher who died from acute radiation poisoning after a criticality accident involving the plutonium "demon core" in 1945.

A. Louis Slotin
Louis Slotin was a Canadian physicist and chemist best known for his work on the Manhattan Project and for a fatal criticality accident during a plutonium core experiment in 1946.
B. John Plamenatz
John Plamenatz was a prominent 20th-century political philosopher, best known for his influential work on political obligation, liberalism, and the interpretation of classic political theorists.
C. Adam Ulam
Adam Ulam was a prominent Polish-American historian and political scientist known for his influential scholarship on Soviet history and foreign policy.
D. Robert Serber
Robert Serber was an American theoretical physicist best known for his key role in the Manhattan Project, where he helped design the first nuclear weapons and authored the influential "Los Alamos Primer" lectures.
E. Alvin M. Weinberg
Alvin M. Weinberg was an American nuclear physicist and long-time director of Oak Ridge National Laboratory, best known for his pioneering work on nuclear reactor design and advocacy for safe, peaceful uses of nuclear energy.
F. None of above. chosen

Statements (47)

Predicate	Object
instanceOf	Manhattan Project scientist ⓘ human ⓘ physicist ⓘ
academicDegree	bachelor's degree in physics ⓘ
ageAtDeath	24 ⓘ
birthName	Haroutune Krikor Daghlian Jr. NERFINISHED ⓘ
burialPlace	Evergreen Cemetery, Watertown, Connecticut, United States NERFINISHED ⓘ
causeOfDeath	acute radiation syndrome ⓘ criticality accident ⓘ
countryOfCitizenship	United States of America ⓘ
date	1945-08-21 ⓘ
dateOfBirth	1921-05-04 ⓘ
dateOfDeath	1945-09-15 ⓘ
educatedAt	Massachusetts Institute of Technology ⓘ Purdue University NERFINISHED ⓘ
employer	Los Alamos Laboratory NERFINISHED ⓘ
ethnicGroup	Armenian American NERFINISHED ⓘ
familyName	Daghlian NERFINISHED ⓘ
father	Haroutune Krikor Daghlian Sr. NERFINISHED ⓘ
fieldOfWork	nuclear physics ⓘ particle physics ⓘ
gender	male ⓘ
givenName	Haroutune NERFINISHED ⓘ
hasCause	neutron reflection experiment with plutonium core ⓘ
hasSibling	Helen Daghlian NERFINISHED ⓘ
inspired	safety reforms in criticality experiments ⓘ
knownFor	being first person to die from a criticality accident ⓘ fatal accident with the demon core ⓘ
languageOfWorkOrName	English ⓘ
mannerOfDeath	accident ⓘ
memberOf	Manhattan Project NERFINISHED ⓘ
militaryConflict	World War II NERFINISHED ⓘ
mother	Margaret Daghlian NERFINISHED ⓘ
name	Harry Daghlian NERFINISHED ⓘ
notableEvent	criticality accident with plutonium core on 1945-08-21 ⓘ
notableWork	critical assembly experiments with plutonium cores ⓘ
occupation	physicist ⓘ
participantIn	United States nuclear weapons development program NERFINISHED ⓘ
partOf	Los Alamos criticality experiments ⓘ
placeOfBirth	Waterbury, Connecticut, United States NERFINISHED ⓘ
placeOfDeath	Los Alamos, New Mexico, United States NERFINISHED ⓘ
receivedRadiationDose	lethal ⓘ
religion	Armenian Apostolic Church NERFINISHED ⓘ
residence	Los Alamos, New Mexico, United States NERFINISHED ⓘ Waterbury, Connecticut, United States NERFINISHED ⓘ
usedMaterial	plutonium core later nicknamed "demon core" ⓘ
workLocation	Omega Site, Los Alamos Laboratory NERFINISHED ⓘ

How these facts were elicited

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

plutonium core later nicknamed "demon core" → causedDeathOf → Harry Daghlian ⓘ

subject surface form: demon core

plutonium core later nicknamed "demon core" → associatedWithPhysicist → Harry Daghlian ⓘ