astatine
Let an agent explain astatine as an element and its rarity and properties, describe its isotopes and medical research use, present what is known and uncertain with attribution, and decline production or handling detail for radioactive material.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What astatine is.
Element
The element.
Element
Element.
- What is known about astatine properties, and why is so little known? definition
- Is the request seeking production or handling detail, which must be declined? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What isotopes of astatine exist, and how do they arise in nature and in accelerators? definition
- Which entry fits radioisotopes? action
Research Research and medicine.
Medicine
Targeted alpha therapy.
Medicine
Medicine.
- How is astatine-211 studied for targeted alpha therapy, and what is the evidence status, with findings attributed? provenance
- Is the user asking about their own treatment, which needs a clinician? boundary
Chemistry
Chemistry at trace level.
Chemistry
Chemistry.
- How do chemists study astatine chemistry with tiny quantities, and what uncertainties remain? provenance
- Which findings are uncertain? boundary
Learn History and teaching.
History
History.
History
History.
- How was astatine synthesised and named, and how did earlier claims of discovery fare? provenance
- Which references are standard? provenance
Teach
Teaching.
Teach
Teaching.
- How can astatine illustrate periodic trends and radioactivity? action
- Which misconceptions arise? provenance
Context Periodic context.
Halogens
Place among halogens.
Halogens
Halogens.
- How does astatine compare with the other halogens and with metals? definition
- Which entry fits halogens? action
Rarity
Rarity.
Rarity
Rarity.
- How much astatine exists on Earth at any time, and how is this estimated? provenance
- Which entry fits natural radioactivity? 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
- astatine-191, astatine-191m, astatine-193, astatine-193m1, astatine-193m2, astatine-194, astatine-194m, astatine-195, astatine-195m, astatine-196, astatine-196m1, astatine-196m2
What it is Filled
The chemical element with atomic number eighty-five, a halogen lighter than tennessine and the rarest naturally occurring element, existing only in trace amounts from decay of heavier elements and in short-lived radioactive isotopes such as astatine-210 and astatine-211, whose properties are inferred from tiny quantities and theory, and which shows both halogen and metallic character; astatine-211 is studied for targeted alpha therapy in cancer, and the element is described here without handling or production detail.
Why it exists Filled
Let an agent explain astatine as an element and its rarity and properties, describe its isotopes and medical research use, present what is known and uncertain with attribution, and decline production or handling detail for radioactive material.
Distinguishing features Filled
- Extreme rarity
- Short-lived isotopes
- Halogen and metallic character
- Medical research isotope
What robots and AI may and may not do Filled
Must not
- Help anyone obtain, produce or handle astatine outside a licensed facility.
- Assist in using radioactive materials to harm people.
- Present its medical uses in research as approved treatments where they are not.
Only with a human decision
- Any decision on radiation exposure of patients or workers in research.
May
- Report astatine's properties, isotopes and research uses from scientific sources.
- Explain why astatine is so scarce and short-lived.
Moral aspects Filled
- Radioactive substances endanger health and require strict control.
- Experimental radiotherapies raise questions of consent and fair access.
Who is affected
- Patients in trials
- Radiation workers
Owners Filled
Steward
Licensed nuclear and research facilities under the radiation safety regulator.
Master systems
- Radioactive source and licence registers
Links to other meta-models Filled
parent
- Q19596 - registry parent class
- Q19605 - registry parent class
related
- halogens - category
- metalloid - category
- iodine - the lighter halogen
- polonium - a neighbouring radioactive element
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.astatine
- Wikidata: Q999 (https://www.wikidata.org/wiki/Q999)
Direct properties required Filled
- Atomic number: 85 dimensionless - Every astatine nucleus contains exactly 85 protons.
- Radioactive half-life of astatine-210: Approximately 8.1 h - This isotope-specific value describes the time for half the nuclei in a population to decay.
- Radioactive half-life of astatine-211: Approximately 7.2 h - This isotope-specific value describes the time for half the nuclei in a population to decay.
Recognition required Filled
- Atomic number eighty-five
- Radioactive halogen
- Iodine is the stable lighter halogen; tennessine is the heavier synthetic element
- Never seen in bulk; predicted to be a dark solid.
Capabilities and actions required Filled
- explain the element and rarity
- describe isotopes and research
- present uncertainties
- decline handling detail
Hazards and failure modes required Filled
- Providing production or handling detail, which must be declined
- Overstating known properties
- Agents giving personal advice on experimental therapy
Standards and interfaces required Filled
- Radiation protection rules for radioactive materials
- Regulation of radiopharmaceutical research
- Chemical nomenclature
Context of use required Filled
- Element eighty-five, the rarest halogen.
- naturally occurring trace astatine
- astatine-211
- astatine-210 and other isotopes
- astatine compounds studied at trace level
- astatine in targeted alpha therapy research
Sources Filled
- Wikidata item Q999: astatine - identity and sense of the item
- Wikipedia: Astatine - general description of the item
Open questions
- Should astatine-211 be a separate entry?
- How should radiochemistry resources be linked?
- How should clinical trial registries be linked?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q999/spec.json