fermium-252
E400609
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| fermium-252 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3921493 — 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: fermium-252 Context triple: [Fermium, hasIsotope, fermium-252]
-
A.
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.
-
B.
Fermium
Fermium is a synthetic, highly radioactive actinide metal with atomic number 100, first identified in the debris of the first hydrogen bomb test and named in honor of physicist Enrico Fermi.
-
C.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
D.
seaborgium
Seaborgium is a synthetic, highly radioactive transition metal and transactinide element with the symbol Sg and atomic number 106.
-
E.
nobelium
Nobelium is a synthetic, highly radioactive actinide element with atomic number 102, named in honor of Alfred Nobel and used primarily for scientific research.
- 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: fermium-252 Target entity description: 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.
-
A.
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.
-
B.
Fermium
Fermium is a synthetic, highly radioactive actinide metal with atomic number 100, first identified in the debris of the first hydrogen bomb test and named in honor of physicist Enrico Fermi.
-
C.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
D.
seaborgium
Seaborgium is a synthetic, highly radioactive transition metal and transactinide element with the symbol Sg and atomic number 106.
-
E.
nobelium
Nobelium is a synthetic, highly radioactive actinide element with atomic number 102, named in honor of Alfred Nobel and used primarily for scientific research.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
actinide isotope
ⓘ
fermium isotope ⓘ radioisotope ⓘ synthetic nuclide ⓘ |
| belongsToSeries | actinide series ⓘ |
| decaysBy |
alpha decay
ⓘ
spontaneous fission ⓘ |
| decaysTo |
californium-248
ⓘ
fission products ⓘ |
| hasAtomicNumber | 100 ⓘ |
| hasCategory |
heavy actinide
ⓘ
transuranium isotope ⓘ |
| hasChargeNumber | +100 ⓘ |
| hasDiscoveryContext | post–World War II nuclear research ⓘ |
| hasElement | fermium ⓘ |
| hasHalfLife | about 25.4 hours ⓘ |
| hasHazard | high radiotoxicity ⓘ |
| hasMass | approximately 252 atomic mass units ⓘ |
| hasMassNumber | 252 ⓘ |
| hasNeutronNumber | 152 ⓘ |
| hasNuclearSpin | 0+ ⓘ |
| hasNucleonNumber | 252 ⓘ |
| hasPrimaryDecayMode | alpha emission ⓘ |
| hasProtonNumber | 100 ⓘ |
| hasSecondaryDecayMode | spontaneous fission ⓘ |
| hasState | ground state ⓘ |
| hasSymbol |
Fm-252
ⓘ
²⁵²Fm ⓘ |
| isHeavierIsotopeOf | fermium-251 ⓘ |
| isHighlyRadioactive | true ⓘ |
| isLighterIsotopeOf | fermium-253 ⓘ |
| isNaturallyOccurring | false ⓘ |
| isProducedIn |
high-flux nuclear reactors
ⓘ
thermonuclear explosion debris (historically) ⓘ |
| isShortLived | true ⓘ |
| isSynthetic | true ⓘ |
| isUsedAs | target material for synthesis of heavier elements ⓘ |
| isUsedFor |
investigation of actinide chemistry
ⓘ
scientific research on heavy elements ⓘ studies of nuclear properties ⓘ |
| requiresHandlingProtocol | remote handling techniques ⓘ |
| wasFirstProducedBy | neutron irradiation of plutonium or heavier actinides ⓘ |
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: fermium-252 Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.