Ivy Mike
E387808
Ivy Mike was the first successful full-scale test of a thermonuclear (hydrogen) bomb conducted by the United States in 1952.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Ivy Mike canonical | 5 |
| Ivy Mike test | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3780818 — 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: Ivy Mike Context triple: [Teller–Ulam design, firstTestedIn, Ivy Mike]
-
A.
Trinity test device
The Trinity test device was the first nuclear explosive ever detonated, a plutonium-based implosion bomb tested by the Manhattan Project in July 1945.
-
B.
Little Boy
Little Boy was the codename for the uranium-based atomic bomb dropped on Hiroshima, Japan, by the United States on August 6, 1945, marking the first use of nuclear weapons in warfare.
-
C.
Castle Bravo
Castle Bravo was the United States’ first and most powerful dry-fuel thermonuclear (hydrogen) bomb test, conducted in 1954 and infamous for its unexpectedly massive yield and severe radioactive fallout.
-
D.
Minuteman III
Minuteman III is an American intercontinental ballistic missile (ICBM) that has served as a key land-based component of the United States' nuclear deterrent since the 1970s.
-
E.
Chicago Pile-2
Chicago Pile-2 was an early research nuclear reactor built at the Argonne site to continue and expand experimental work following the first controlled chain reaction achieved by Chicago Pile-1.
- 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: Ivy Mike Target entity description: Ivy Mike was the first successful full-scale test of a thermonuclear (hydrogen) bomb conducted by the United States in 1952.
-
A.
Trinity test device
The Trinity test device was the first nuclear explosive ever detonated, a plutonium-based implosion bomb tested by the Manhattan Project in July 1945.
-
B.
Little Boy
Little Boy was the codename for the uranium-based atomic bomb dropped on Hiroshima, Japan, by the United States on August 6, 1945, marking the first use of nuclear weapons in warfare.
-
C.
Castle Bravo
Castle Bravo was the United States’ first and most powerful dry-fuel thermonuclear (hydrogen) bomb test, conducted in 1954 and infamous for its unexpectedly massive yield and severe radioactive fallout.
-
D.
Minuteman III
Minuteman III is an American intercontinental ballistic missile (ICBM) that has served as a key land-based component of the United States' nuclear deterrent since the 1970s.
-
E.
Chicago Pile-2
Chicago Pile-2 was an early research nuclear reactor built at the Argonne site to continue and expand experimental work following the first controlled chain reaction achieved by Chicago Pile-1.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
United States nuclear weapons test
ⓘ
nuclear weapons test ⓘ thermonuclear test ⓘ |
| codeName | Mike ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| craterDepth | about 50 meters ⓘ |
| craterDiameter | about 1.9 kilometers ⓘ |
| date | 1952-11-01 ⓘ |
| delivery | non-deliverable experimental device ⓘ |
| demonstrated | practicality of staged thermonuclear weapons ⓘ |
| design | Teller–Ulam design ⓘ |
| destroyed | Elugelab island NERFINISHED ⓘ |
| deviceType |
hydrogen bomb
ⓘ
thermonuclear bomb ⓘ |
| fallout | significant radioactive fallout ⓘ |
| followedBy | Castle Bravo ⓘ |
| impact | accelerated development of deployable hydrogen bombs ⓘ |
| included |
fission primary stage
ⓘ
fusion secondary stage ⓘ |
| location |
Enewetak Atoll
NERFINISHED
ⓘ
Marshall Islands ⓘ |
| massCharacteristic | very large cryogenic device ⓘ |
| operationCodeName | Ivy ⓘ |
| operator |
United States
ⓘ
linked to:
United States of America
|
| partOf | Operation Ivy ⓘ |
| precededBy | earlier fission bomb tests ⓘ |
| primaryFuel |
deuterium
ⓘ
liquid deuterium ⓘ |
| purpose | proof-of-concept thermonuclear device test ⓘ |
| radiochemicalTracer | uranium-238 tamper ⓘ |
| region | Pacific Proving Grounds ⓘ |
| relatedTo |
Cold War
ⓘ
United States–Soviet nuclear arms race ⓘ
linked to:
Cold War
|
| significance |
first full-scale thermonuclear device test
ⓘ
first successful hydrogen bomb test by the United States ⓘ |
| site | Elugelab ⓘ |
| testedBy |
Los Alamos National Laboratory
ⓘ
linked to:
Los Alamos Laboratory
United States Atomic Energy Commission ⓘ |
| testSeries | Operation Ivy ⓘ |
| testTime | 07:15 local time ⓘ |
| testType |
atmospheric nuclear test
ⓘ
surface burst ⓘ |
| usedCryogenics | true ⓘ |
| year | 1952 ⓘ |
| yield | 10.4 megatons of TNT ⓘ |
| yieldClass | megaton-range ⓘ |
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: Ivy Mike Description of subject: Ivy Mike was the first successful full-scale test of a thermonuclear (hydrogen) bomb conducted by the United States in 1952.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.