Harry Daghlian
E726893
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Harry Daghlian canonical | 5 |
| Daghlian | 1 |
| Haroutune Krikor Daghlian Jr. | 1 |
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.
ⓘ
linked to:
Harry Daghlian
|
| burialPlace | Evergreen Cemetery, Watertown, Connecticut, United States ⓘ |
| 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 ⓘ |
| employer | Los Alamos Laboratory ⓘ |
| ethnicGroup |
Armenian American
ⓘ
linked to:
Armenians
|
| familyName |
Daghlian
ⓘ
linked to:
Harry Daghlian
|
| father | Haroutune Krikor Daghlian Sr. ⓘ |
| fieldOfWork |
nuclear physics
ⓘ
particle physics ⓘ |
| gender | male ⓘ |
| givenName | Haroutune ⓘ |
| hasCause | neutron reflection experiment with plutonium core ⓘ |
| hasSibling | Helen Daghlian ⓘ |
| 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 ⓘ |
| militaryConflict | World War II ⓘ |
| mother | Margaret Daghlian ⓘ |
| name | Harry Daghlian ⓘ |
| 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
ⓘ
linked to:
United States nuclear weapons program
|
| partOf | Los Alamos criticality experiments ⓘ |
| placeOfBirth | Waterbury, Connecticut, United States ⓘ |
| placeOfDeath |
Los Alamos, New Mexico, United States
ⓘ
linked to:
Los Alamos, New Mexico
|
| receivedRadiationDose | lethal ⓘ |
| religion | Armenian Apostolic Church ⓘ |
| residence |
Los Alamos, New Mexico, United States
ⓘ
linked to:
Los Alamos, New Mexico
Waterbury, Connecticut, United States ⓘ |
| usedMaterial | plutonium core later nicknamed "demon core" ⓘ |
| workLocation |
Omega Site, Los Alamos Laboratory
ⓘ
linked to:
Los Alamos Laboratory
|
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Harry Daghlian Description of subject: 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.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
plutonium core later nicknamed "demon core"
subject linked to:
plutonium core later nicknamed "demon core"
subject linked to:
demon core
subject linked to:
demon core
linked to: Harry Daghlian
linked to: Harry Daghlian