neptunium
Let an agent explain neptunium as an element, relay its isotopes, occurrence, chemistry and role in nuclear waste from chemistry references, describe its history and public uses in general terms, and distinguish neptunium from uranium and plutonium, without providing sensitive nuclear detail.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What neptunium is.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of neptunium? definition
- Is the question about the element and its public science, or about sensitive nuclear matters the model does not cover? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What isotopes exist, and what are the roles of neptunium-237 and 239? measurement
- Which entry fits the specific isotope? action
Occur Occurrence and production.
Occurrence
Occurrence.
Occurrence
Occurrence.
- Where does neptunium occur naturally, and how is it produced in reactors, in general terms? provenance
- Which references are standard? provenance
Chemistry
Chemistry.
Chemistry
Chemistry.
- What is the chemistry of neptunium across its oxidation states? provenance
- Which sources are cited? provenance
Use Uses and waste.
Uses
Uses.
Uses
Uses.
- How is neptunium-237 used as a source for plutonium-238 for space power and in detectors, in public terms? provenance
- Which entry fits plutonium-238? action
Waste
Nuclear waste.
Waste
Waste.
- Why does neptunium-237 matter for long-term waste disposal, and how is it addressed, with positions attributed? provenance
- Which entry fits radioactive waste? action
Context Safety and history.
Safety
Safety.
Safety
Safety.
- What are the hazards of neptunium, and how is it handled and safeguarded? provenance
- Which entry fits radiation protection? action
History
History.
History
History.
- How was neptunium discovered by McMillan and Abelson in 1940, and why was it named after Neptune? provenance
- Which entry fits the discovery of transuranium elements? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- neptunium-225, neptunium-226, neptunium-227, neptunium-228, neptunium-229, neptunium-230, neptunium-231, neptunium-232, neptunium-233, neptunium-234, neptunium-235, neptunium-236
What it is Filled
A chemical element with symbol Np and atomic number 93, the first transuranium element, a silvery radioactive actinide metal produced in nuclear reactors by neutron capture in uranium and found in trace amounts in uranium ores, with neptunium-237 the longest-lived isotope at about 2.14 million years and a major component of long-lived nuclear waste, alongside short-lived isotopes such as neptunium-225 to 230 known from experiments; neptunium-237 is also the parent of the neptunium decay series and a source for plutonium-238 production, described here at the level of public reference sources.
Why it exists Filled
Let an agent explain neptunium as an element, relay its isotopes, occurrence, chemistry and role in nuclear waste from chemistry references, describe its history and public uses in general terms, and distinguish neptunium from uranium and plutonium, without providing sensitive nuclear detail.
Distinguishing features Filled
- First transuranic
- Long-lived waste isotope
- Decay series parent
- Reactor-produced
What robots and AI may and may not do Filled
Must not
- Provide guidance on obtaining, separating or concentrating neptunium.
- Assist in any use of neptunium toward nuclear weapons or radiological harm.
- Handle, move or dispose of radioactive material outside a licensed facility and its controls.
- Understate the long-term hazard of neptunium in waste.
Only with a human decision
- Any action involving actual neptunium-bearing material, which only licensed staff may take.
- Answering questions that go beyond general science toward production or separation.
May
- Give neptunium's place in the periodic table, its general properties and its role in nuclear waste.
- Explain in general terms why neptunium matters for waste storage and radiation protection.
Moral aspects Filled
- Neptunium stays hazardous for millions of years, so today's waste choices bind many generations.
- Knowledge about transuranium elements touches nuclear security and must stay at a general level.
Who is affected
- Workers at nuclear facilities
- Communities near waste sites
- Future generations
Owners Filled
Steward
The licensed operator of the facility that holds it, under the national nuclear regulator.
Master systems
- National nuclear material accountancy records
Links to other meta-models Filled
parent
- Q105789 - registry parent class
- Q19577 - registry parent class
related
- actinide - in registry terms
- heavy metal - in registry terms
- uranium-238 - by neutron capture
- plutonium-239 - via neptunium-239
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.neptunium
- Wikidata: Q1105 (https://www.wikidata.org/wiki/Q1105)
- CAS: 7439-99-8 neptunium
- symbol: Np element
Direct properties required Filled
- atomic number: 93 Z
- density: about 20.45 g/cm^3
- neptunium-237 half-life: about 2.14 million years
- crustal abundance: trace note - from uranium neutron capture
Recognition required Filled
- First transuranium element
- Neptunium-237 long-lived isotope, neptunium-239 intermediate, short-lived isotopes 225 to 230 and others
- Uranium is element 92; plutonium is element 94
- A silvery metal that tarnishes in air.
Capabilities and actions required Filled
- explain properties and isotopes
- relay occurrence and chemistry
- describe waste and uses in general
- distinguish from neighbouring elements
Hazards and failure modes required Filled
- Radiotoxicity
- Long-lived waste burden
- Agents providing sensitive nuclear detail
Standards and interfaces required Filled
- IAEA safeguards and nuclear material controls
- Radioactive waste management regulations
- Radiation protection standards
Context of use required Filled
- Research; source for plutonium-238; a waste component.
- neptunium-237 in waste and as a plutonium-238 source
- neptunium-239 as the intermediate to plutonium-239
- short-lived isotopes such as neptunium-225 to 230
- neptunium compounds in oxidation states +3 to +7
Sources Filled
- Wikidata item Q1105: neptunium - identity and sense of the item
- Wikipedia: Neptunium - general description of the item
Open questions
- Should isotopes of neptunium and the neptunium series be separate entries?
- How should chemistry references be linked?
- The registry entry has merged aliases naming individual isotopes; should they be split off?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1105/spec.json