{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-13T02:51:47Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 3, "engine": "claude", "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T10:00:00Z", "ingestedAt": "2026-10-06T07:11:28+00:00", "fields": [ "agent_conduct", "ethics", "owners" ] }, "gate": { "passed": true, "version": "1.0", "at": "2026-10-06T19:51:53+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q1121", "registryId": "vr.tr.actinium", "name": "actinium", "version": "0.2.0-wave.3", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q1121/", "model": { "registry_id": "vr.tr.actinium", "name": "actinium", "purpose": "Let an agent describe actinium and its properties, relay isotopes and their uses from chemistry and nuclear data sources, describe medical applications in general terms, and relay safety and regulation without operational detail.", "definition": "A radioactive chemical element with symbol Ac and atomic number 89, a soft silvery metal that glows faintly blue in the dark from its radioactivity, the first of the actinide series, occurring in trace amounts in uranium and thorium ores, with isotopes from actinium-205 to actinium-236 including the long lived actinium-227 and the medical isotope actinium-225 used in targeted alpha therapy; actinium is produced in reactors and accelerators and is handled under strict radiological controls.", "what_it_is_for": "Research and targeted alpha therapy isotopes.", "affordances": [ "describe properties", "relay isotopes and uses", "describe medical applications", "relay safety and regulation" ], "distinguishing_features": [ "First actinide", "Intense radioactivity", "Medical alpha emitter", "Trace natural occurrence" ], "appearance": "A soft silvery-white metal with a faint blue glow in the dark.", "visual_identification": [ "Radioactive element 89", "Isotopes actinium-205 to 236, notably Ac-225 and Ac-227", "Thorium and protactinium are neighbouring actinides; lanthanum is the chemical analogue" ], "physical_properties": [ { "quantity": "atomic number", "typical_range": "89", "unit": "count", "note": "" }, { "quantity": "Ac-227 half-life", "typical_range": "21.77", "unit": "years", "note": "" }, { "quantity": "Ac-225 half-life", "typical_range": "9.92", "unit": "days", "note": "" }, { "quantity": "melting point", "typical_range": "about 1050", "unit": "C", "note": "" } ], "families_and_kinds": [ "natural actinium-227 and actinium-228 in decay chains", "medical actinium-225", "short lived isotopes such as actinium-205 to actinium-208 and their isomers", "actinium compounds such as the oxide and halides" ], "related_models": [ { "relation": "is a kind of", "target": "heavy metal", "why": "in registry terms" }, { "relation": "begins", "target": "actinide", "why": "series" }, { "relation": "is used in", "target": "targeted alpha therapy", "why": "as actinium-225" }, { "relation": "occurs in", "target": "uranium ore", "why": "in trace amounts" } ], "identifiers": [ { "scheme": "symbol", "value_or_pattern": "Ac", "note": "" }, { "scheme": "CAS", "value_or_pattern": "7440-34-8", "note": "" } ], "standards_and_regulation": [ "Radiation protection laws and IAEA safety standards", "Nuclear material licensing", "Medical isotope regulation" ], "failure_modes_and_hazards": [ "Radiation exposure", "Agents providing operational nuclear or separation detail", "Supply shortages of actinium-225" ], "in_scope": [], "out_of_scope": [], "characteristics": [], "agent_conduct": { "may": [ "Explain the element's chemistry, isotopes and its place in the actinide series, citing reference sources.", "Report published data on actinium isotopes and their medical research use." ], "must_not": [ "Give guidance on obtaining, handling, separating or preparing radioactive material.", "Advise anyone outside a licensed facility on working with radionuclides.", "Present radiopharmaceutical research as an available treatment.", "Help evade nuclear material controls, licensing or transport rules." ], "requires_human": [ "Any handling, transport or disposal of radioactive material, which belongs to licensed operators.", "Any clinical use of a radiopharmaceutical for a patient." ] }, "ethics": { "considerations": [ "Radioactive materials harm anyone exposed, including workers and people near a release.", "Scarce medical isotopes raise questions of who gets access to promising treatments." ], "affected_parties": [ "Radiation workers", "Patients in radiopharmaceutical treatment", "People near facilities and transport routes" ] }, "owners": { "steward": "Licensed operators hold it under national nuclear regulatory authorities.", "master_systems": [ "National nuclear material accounting registers" ] } }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q1121: actinium", "url": "https://www.wikidata.org/wiki/Q1121", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: Actinium", "url": "https://en.wikipedia.org/wiki/Actinium", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "understand", "name": "Understand", "description": "What actinium is.", "rationale": "Science.", "layers": [ { "id": "properties", "name": "Properties", "description": "Properties.", "findings": [ { "id": "properties-finding", "name": "Properties", "description": "Properties.", "questions": [ { "text": "What are the physical and chemical properties of actinium, and how does it compare with lanthanum?", "kind": "definition" }, { "text": "Is the question about the element, a specific isotope or the actinide series?", "kind": "boundary" } ] } ] }, { "id": "isotopes", "name": "Isotopes", "description": "Isotopes.", "findings": [ { "id": "isotopes-finding", "name": "Isotopes", "description": "Isotopes.", "questions": [ { "text": "What isotopes of actinium exist, and what are their half-lives and decay modes?", "kind": "definition" }, { "text": "Which entry fits the specific isotope?", "kind": "action" } ] } ] } ] }, { "id": "use", "name": "Use", "description": "Uses.", "rationale": "Application.", "layers": [ { "id": "medicine", "name": "Medicine", "description": "Targeted alpha therapy.", "findings": [ { "id": "medicine-finding", "name": "Medicine", "description": "Medicine.", "questions": [ { "text": "How is actinium-225 used in targeted alpha therapy, and what does research show, with attribution?", "kind": "provenance" }, { "text": "Is the user asking about their own treatment, which needs their oncology team?", "kind": "boundary" } ] } ] }, { "id": "other", "name": "Other", "description": "Other uses.", "findings": [ { "id": "other-finding", "name": "Other", "description": "Other.", "questions": [ { "text": "How is actinium used as a neutron source and in research, in general terms?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] } ] }, { "id": "produce", "name": "Produce", "description": "Occurrence and production.", "rationale": "Regulation.", "layers": [ { "id": "occurrence", "name": "Occurrence", "description": "Occurrence.", "findings": [ { "id": "occurrence-finding", "name": "Occurrence", "description": "Occurrence.", "questions": [ { "text": "Where does actinium occur naturally, and how much exists?", "kind": "provenance" }, { "text": "Which sources are cited?", "kind": "provenance" } ] } ] }, { "id": "production", "name": "Production", "description": "Production and supply.", "findings": [ { "id": "production-finding", "name": "Production", "description": "Production.", "questions": [ { "text": "How is actinium produced in general terms, and why is actinium-225 supply limited?", "kind": "provenance" }, { "text": "Which entry fits medical isotope production?", "kind": "action" } ] } ] } ] }, { "id": "context", "name": "Context", "description": "History and safety.", "rationale": "Context.", "layers": [ { "id": "history", "name": "History", "description": "History.", "findings": [ { "id": "history-finding", "name": "History", "description": "History.", "questions": [ { "text": "How was actinium discovered by Debierne and Giesel, and how was it named?", "kind": "provenance" }, { "text": "Which entry fits the history of the actinides?", "kind": "action" } ] } ] }, { "id": "safety", "name": "Safety", "description": "Safety.", "findings": [ { "id": "safety-finding", "name": "Safety", "description": "Safety.", "questions": [ { "text": "What radiological hazards does actinium pose, and how is it regulated?", "kind": "provenance" }, { "text": "Which entry fits radiation protection?", "kind": "action" } ] } ] } ] } ] }, "openQuestions": [ "Should actinium-225 be a separate entry?", "How should nuclear data sources be linked?", "The registry entry has merged aliases naming many isotopes; should they be split off?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }