protactinium
Let an agent explain protactinium as an element, relay its isotopes, occurrence and chemistry from chemistry references, describe its role in the thorium fuel cycle and dating in general terms, and distinguish protactinium from thorium, uranium and neighbouring actinides.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What protactinium is.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of protactinium? definition
- Is the question about the element, an isotope or a neighbouring actinide? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What isotopes exist, and what are the roles of protactinium-231 and 233? measurement
- Which entry fits the specific isotope? action
Occur Occurrence and chemistry.
Occurrence
Occurrence.
Occurrence
Occurrence.
- Where does protactinium occur, and how is it isolated? provenance
- Which references are standard? provenance
Chemistry
Chemistry.
Chemistry
Chemistry.
- What is the chemistry of protactinium in its oxidation states? provenance
- Which sources are cited? provenance
Use Uses.
Nuclear
Thorium cycle.
Nuclear
Nuclear.
- What role does protactinium-233 play in the thorium fuel cycle, in general terms? provenance
- Which entry fits thorium fuel cycle? action
Dating
Dating.
Dating
Dating.
- How is protactinium-231 used in dating marine sediments? provenance
- Which entry fits uranium-thorium dating? action
Context Safety and history.
Safety
Safety.
Safety
Safety.
- What are the hazards of protactinium, and how is it handled? provenance
- Which entry fits radiation protection? action
History
History.
History
History.
- How was protactinium discovered by Fajans, Gohring, Hahn and Meitner? provenance
- Which entry fits the history of the periodic table? 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
- protactinium-212, protactinium-213, protactinium-214, protactinium-215, protactinium-216, protactinium-217, protactinium-218, protactinium-219, protactinium-220, protactinium-221, protactinium-222, protactinium-223
What it is Filled
A chemical element with symbol Pa and atomic number 91, a dense, silvery radioactive actinide metal occurring in trace amounts in uranium ores as a decay product, with protactinium-231 the longest-lived isotope at about 32700 years and protactinium-233 an intermediate in the thorium fuel cycle, together with short-lived isotopes such as protactinium-212 to 217 known from experiments; protactinium has no significant uses beyond research and is highly toxic and radioactive, so it is handled only in specialised laboratories.
Why it exists Filled
Let an agent explain protactinium as an element, relay its isotopes, occurrence and chemistry from chemistry references, describe its role in the thorium fuel cycle and dating in general terms, and distinguish protactinium from thorium, uranium and neighbouring actinides.
Distinguishing features Filled
- Rare actinide
- Decay product of uranium
- Thorium cycle intermediate
- Highly toxic and radioactive
What robots and AI may and may not do Filled
Must not
- Provide sensitive nuclear detail or methods for separating or concentrating it.
- Advise handling radioactive material without licensed facilities.
- Confuse protactinium with thorium or uranium in safety information.
Only with a human decision
- Any possession, transfer or experiment involving radioactive material.
May
- Describe protactinium's properties and occurrence from scientific sources.
- Explain its role in radiometric dating in general terms.
Moral aspects Filled
- Radioactive materials can harm workers and the public if mishandled.
- Nuclear information is controlled to prevent misuse.
Who is affected
- Laboratory workers
- The public
- Students
Owners Filled
Steward
The licensed holder, under the national nuclear regulator.
Master systems
- National registers of radioactive sources and materials
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
- thorium fuel cycle - as protactinium-233
- uranium-235 - via actinium series
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.protactinium
- Wikidata: Q1109 (https://www.wikidata.org/wiki/Q1109)
- CAS: 7440-13-3 protactinium
- symbol: Pa element
Direct properties required Filled
- atomic number: 91 Z
- density: about 15.4 g/cm^3
- protactinium-231 half-life: about 32760 years
- crustal abundance: trace note - from uranium decay
Recognition required Filled
- Radioactive actinide between thorium and uranium
- Protactinium-231 and 233; short-lived isotopes 212 to 217 and others
- Thorium is element 90; uranium is element 92
- A bright silvery metal that tarnishes in air.
Capabilities and actions required Filled
- explain properties and isotopes
- relay occurrence and chemistry
- describe research uses
- distinguish from neighbouring elements
Hazards and failure modes required Filled
- Radiotoxicity
- Confusing with thorium or uranium
- Agents providing sensitive nuclear detail
Standards and interfaces required Filled
- Radiation protection and nuclear material controls
- Laboratory safety rules for actinides
Context of use required Filled
- Research; intermediate in the thorium fuel cycle.
- protactinium-231 in uranium ores
- protactinium-233 in the thorium fuel cycle
- short-lived isotopes such as protactinium-212 to 217
- protactinium compounds in the +4 and +5 states
Sources Filled
- Wikidata item Q1109: protactinium - identity and sense of the item
- Wikipedia: Protactinium - general description of the item
Open questions
- Should isotopes of protactinium be a separate entry?
- 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-q1109/spec.json