uranium-235
E626843
Uranium-235 is a fissile isotope of uranium that readily undergoes nuclear fission, making it crucial for both nuclear power generation and atomic weapons.
All labels observed (1)
| Label | Occurrences |
|---|---|
| uranium-235 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6906407 — 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: uranium-235 Context triple: [Meitner–Frisch interpretation of fission, hasSubject, uranium-235]
-
A.
fermium-252
Fermium-252 is a highly radioactive synthetic isotope of the actinide element fermium, notable for its use in scientific research on heavy elements and nuclear properties.
-
B.
californium-252
Californium-252 is a highly radioactive synthetic isotope of californium widely used as a strong neutron source in applications such as nuclear reactor startup, neutron radiography, and cancer therapy.
-
C.
neptunium
Neptunium is a radioactive, synthetic actinide metal and the first transuranium element, used mainly in nuclear research and reactor applications.
-
D.
Plutonium (Ploutonion)
Plutonium (Ploutonion) is an ancient Greco-Roman religious sanctuary and cave at Hierapolis, believed to be an entrance to the underworld and associated with the god Pluto/Hades.
-
E.
Zirc
Zirc is a small Hungarian town in Veszprém County known for its historic Cistercian Abbey and scenic location in the Bakony Mountains.
- 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: uranium-235 Target entity description: Uranium-235 is a fissile isotope of uranium that readily undergoes nuclear fission, making it crucial for both nuclear power generation and atomic weapons.
-
A.
fermium-252
Fermium-252 is a highly radioactive synthetic isotope of the actinide element fermium, notable for its use in scientific research on heavy elements and nuclear properties.
-
B.
californium-252
Californium-252 is a highly radioactive synthetic isotope of californium widely used as a strong neutron source in applications such as nuclear reactor startup, neutron radiography, and cancer therapy.
-
C.
neptunium
Neptunium is a radioactive, synthetic actinide metal and the first transuranium element, used mainly in nuclear research and reactor applications.
-
D.
Plutonium (Ploutonion)
Plutonium (Ploutonion) is an ancient Greco-Roman religious sanctuary and cave at Hierapolis, believed to be an entrance to the underworld and associated with the god Pluto/Hades.
-
E.
Zirc
Zirc is a small Hungarian town in Veszprém County known for its historic Cistercian Abbey and scenic location in the Bakony Mountains.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
actinide isotope
ⓘ
fissile material ⓘ radioisotope ⓘ uranium isotope ⓘ |
| atomicNumber | 92 ⓘ |
| averageEnergyReleasedPerFission | about 200 MeV ⓘ |
| averageNeutronsPerFission | about 2.4 ⓘ |
| belongsToSeries | uranium-238 decay series ⓘ |
| chemicalFormInFuel |
uranium dioxide
ⓘ
uranium hexafluoride ⓘ |
| criticalFor |
chain reactions in fast reactors
ⓘ
chain reactions in thermal reactors ⓘ |
| decaysTo | thorium-231 ⓘ |
| discoveredAsIsotopeBy | Arthur Jeffrey Dempster ⓘ |
| enrichmentMethodsInclude |
gas centrifuge
ⓘ
gaseous diffusion ⓘ laser isotope separation ⓘ |
| enrichmentRequiredForPowerReactors | typically 3–5 percent U-235 ⓘ |
| enrichmentRequiredForWeaponsGrade | typically above 90 percent U-235 ⓘ |
| fissileWith |
fast neutrons
ⓘ
thermal neutrons ⓘ |
| fissionProduces |
delayed neutrons
ⓘ
fission fragments ⓘ gamma radiation ⓘ prompt neutrons ⓘ |
| foundIn | natural uranium ore ⓘ |
| halfLife | about 7.04×10^8 years ⓘ |
| massNumber | 235 ⓘ |
| naturalAbundanceInUranium |
about 0.72 percent by atoms
ⓘ
about 0.72 percent by weight ⓘ |
| neutronCaptureProduct | uranium-236 ⓘ |
| oxidationStatesInCompounds |
+4
ⓘ
+6 ⓘ |
| parentElement | uranium ⓘ |
| producedBy | isotope enrichment of natural uranium ⓘ |
| radioactiveDecayMode | alpha decay ⓘ |
| safetyConcern | proliferation risk due to weapons usability ⓘ |
| standardAtomicWeightApprox | 235.0439299 u ⓘ |
| symbol | U-235 ⓘ |
| typicalThermalNeutronCaptureCrossSection | about 98 barns ⓘ |
| typicalThermalNeutronFissionCrossSection | about 585 barns ⓘ |
| usedIn |
boiling water reactors
ⓘ
gun-type fission weapons ⓘ implosion-type fission weapons ⓘ nuclear power reactors ⓘ nuclear weapons ⓘ pressurized water reactors ⓘ research reactors ⓘ |
| yearOfIsotopeIdentification | 1935 ⓘ |
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: uranium-235 Description of subject: Uranium-235 is a fissile isotope of uranium that readily undergoes nuclear fission, making it crucial for both nuclear power generation and atomic weapons.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.