californium-252
E393260
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| californium-252 canonical | 1 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
californium isotope
ⓘ
neutron source ⓘ radioisotope ⓘ synthetic isotope ⓘ |
| atomicNumber | 98 ⓘ |
| belongsToSeries | actinide series ⓘ |
| chemicalElementCategory | actinide ⓘ |
| decayMode |
alpha decay
ⓘ
spontaneous fission ⓘ |
| discoveredAt | University of California, Berkeley ⓘ |
| discoveredBy |
Albert Ghiorso
ⓘ
Glenn T. Seaborg ⓘ Kenneth Street Jr. ⓘ Stanley G. Thompson ⓘ |
| discoveredInCountry |
United States of America
ⓘ
surface form:
United States
|
| discoveredInYear | 1952 ⓘ |
| elementSymbol | Cf ⓘ |
| halfLife |
2.645 years
ⓘ
about 2.6 years ⓘ |
| isotopeOf | californium ⓘ |
| isSynthetic | true ⓘ |
| massNumber | 252 ⓘ |
| neutronEmissionRate | about 2.3×10^12 neutrons per second per gram ⓘ |
| neutronNumber | 154 ⓘ |
| occursNaturally | false ⓘ |
| primaryDecayMode | alpha decay ⓘ |
| producedBy | neutron irradiation of curium ⓘ |
| producedIn | nuclear reactors ⓘ |
| radiationTypeEmitted |
alpha particles
ⓘ
gamma rays ⓘ neutrons ⓘ |
| requiresShielding | yes ⓘ |
| safetyConcern |
highly radioactive
ⓘ
strong neutron emitter ⓘ |
| significantDecayMode | spontaneous fission ⓘ |
| spontaneousFissionBranchingRatio | about 3.1 percent ⓘ |
| typicalShieldingMaterial |
concrete
ⓘ
polyethylene ⓘ water ⓘ |
| usedFor |
brachytherapy neutron sources
ⓘ
calibration of neutron detectors ⓘ cancer therapy research ⓘ industrial radiography ⓘ moisture gauge calibration ⓘ neutron activation analysis ⓘ neutron flux monitoring ⓘ neutron radiography ⓘ nuclear reactor startup ⓘ well logging ⓘ |
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: californium-252 Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.