Semipalatinsk Test Site
E514983
The Semipalatinsk Test Site was the primary Soviet nuclear weapons testing ground, located in northeastern Kazakhstan and notorious for extensive radioactive contamination and long-term health impacts on local populations.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Semipalatinsk Test Site canonical | 7 |
| Semipalatinsk Nuclear Test Site | 1 |
| Semipalatinsk-21 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5377630 — 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: Semipalatinsk Test Site Context triple: [Kazakh SSR, hostedFacility, Semipalatinsk Test Site]
-
A.
Obninsk
Obninsk is a Russian city best known as the site of the world’s first grid-connected nuclear power plant and an important center for nuclear and scientific research.
-
B.
Kapustin Yar
Kapustin Yar is a Russian military rocket launch and development site historically used for early Soviet missile and space tests.
-
C.
Cholpon-Ata
Cholpon-Ata is a popular resort town on the northern shore of Lake Issyk-Kul in Kyrgyzstan, known for its beaches, mountain scenery, and archaeological sites.
-
D.
Sarov
Sarov is a closed Russian city in Nizhny Novgorod Oblast known as a major center for nuclear research and weapons development.
-
E.
Onsan National Industrial Complex
Onsan National Industrial Complex is a major South Korean industrial zone in Ulsan known for its large-scale petrochemical, metal, and heavy manufacturing facilities.
- 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: Semipalatinsk Test Site Target entity description: The Semipalatinsk Test Site was the primary Soviet nuclear weapons testing ground, located in northeastern Kazakhstan and notorious for extensive radioactive contamination and long-term health impacts on local populations.
-
A.
Obninsk
Obninsk is a Russian city best known as the site of the world’s first grid-connected nuclear power plant and an important center for nuclear and scientific research.
-
B.
Kapustin Yar
Kapustin Yar is a Russian military rocket launch and development site historically used for early Soviet missile and space tests.
-
C.
Cholpon-Ata
Cholpon-Ata is a popular resort town on the northern shore of Lake Issyk-Kul in Kyrgyzstan, known for its beaches, mountain scenery, and archaeological sites.
-
D.
Sarov
Sarov is a closed Russian city in Nizhny Novgorod Oblast known as a major center for nuclear research and weapons development.
-
E.
Onsan National Industrial Complex
Onsan National Industrial Complex is a major South Korean industrial zone in Ulsan known for its large-scale petrochemical, metal, and heavy manufacturing facilities.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf | nuclear test site ⓘ |
| affectedPopulation |
nearby rural communities
ⓘ
residents of Semey region ⓘ |
| alsoKnownAs |
Semipalatinsk Nuclear Test Site
ⓘ
linked to:
Semipalatinsk Test Site
The Polygon ⓘ |
| area | approximately 18,000 square kilometers ⓘ |
| associatedMovement | Nevada–Semipalatinsk anti-nuclear movement ⓘ |
| closedBy | Nursultan Nazarbayev ⓘ |
| closureDate | 1991-08-29 ⓘ |
| country | Soviet Union ⓘ |
| environmentalImpact | extensive radioactive contamination ⓘ |
| firstNuclearDeviceTested |
RDS-1
ⓘ
linked to:
RDS-1 test
|
| firstNuclearTest | 1949-08-29 ⓘ |
| formerName |
Semipalatinsk-21
ⓘ
linked to:
Semipalatinsk Test Site
|
| governedBy |
Soviet Ministry of Defense
ⓘ
linked to:
Ministry of Defense of the USSR
|
| healthImpact |
genetic defects in exposed populations
ⓘ
increased cancer rates in local population ⓘ long-term radiation-related illnesses ⓘ |
| inception | 1947 ⓘ |
| jurisdictionAfter1991 |
Republic of Kazakhstan
ⓘ
linked to:
Kazakhstan
|
| legacy |
major public health disaster in Kazakhstan
ⓘ
symbol of anti-nuclear movement in Kazakhstan ⓘ |
| locatedIn |
Kazakhstan
ⓘ
northeastern Kazakhstan ⓘ |
| locatedNear |
Irtysh River
ⓘ
Semey ⓘ |
| monitoringBy |
Kazakh authorities
ⓘ
international scientific organizations ⓘ |
| numberOfAtmosphericTests | over 100 ⓘ |
| numberOfTests | over 450 ⓘ |
| numberOfUndergroundTests | over 300 ⓘ |
| operator |
Soviet Armed Forces
ⓘ
linked to:
Soviet armed forces
Soviet nuclear weapons program ⓘ
linked to:
Soviet thermonuclear weapons program
|
| partlyRehabilitated | true ⓘ |
| partOf |
Soviet nuclear weapons complex
ⓘ
linked to:
Soviet nuclear industry
|
| postClosureUse |
limited economic activities under control
ⓘ
radiation monitoring ⓘ scientific research ⓘ |
| risk | residual radioactive contamination ⓘ |
| significantFor |
Cold War nuclear arms race
ⓘ
linked to:
Cold War nuclear testing
development of Soviet thermonuclear weapons ⓘ |
| startDate | 1949-08-29 ⓘ |
| testPeriodEnd | 1989 ⓘ |
| testPeriodStart | 1949 ⓘ |
| usedFor |
nuclear weapons testing
ⓘ
peaceful nuclear explosions ⓘ weapons development research ⓘ |
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: Semipalatinsk Test Site Description of subject: The Semipalatinsk Test Site was the primary Soviet nuclear weapons testing ground, located in northeastern Kazakhstan and notorious for extensive radioactive contamination and long-term health impacts on local populations.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
Soviet atomic bomb project (indirectly, via espionage)
→
testSiteOfFirstBomb
→
Semipalatinsk Test Site
ⓘ
linked to: Semipalatinsk Test Site
linked to: Semipalatinsk Test Site