{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T22:16:24Z",
    "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": "2026-10-06T06:58:19+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "revisions": [
      {
        "at": "2026-10-06T22:39:07+00:00",
        "engine": "codex",
        "fields": [
          "definition",
          "distinguishing_features"
        ],
        "answering_review": "2488d6893195ab9a07161e0b9b5b61c050a9bac0da80c8278167a69843bae782"
      }
    ],
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:27+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q1809",
    "registryId": "vr.tr.promethium",
    "name": "promethium",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1809/",
  "model": {
    "registry_id": "vr.tr.promethium",
    "name": "promethium",
    "purpose": "Let an agent identify promethium and its properties, relay isotopes, production and uses from reference sources, relay radiation safety information, and distinguish it from neighbouring lanthanides.",
    "definition": "A chemical element with symbol Pm and atomic number 61, a radioactive lanthanide with no stable isotopes, of which promethium-145 is the longest-lived at about 17.7 years and promethium-147 the most used; it occurs naturally only in trace amounts from uranium fission and neodymium-150 decay and is produced in reactors, and it has been used in luminous paint, nuclear batteries and thickness gauges.",
    "what_it_is_for": "Nuclear batteries, luminous sources and research.",
    "affordances": [
      "relay properties and isotopes",
      "explain production and uses",
      "relay radiation safety information",
      "distinguish from other lanthanides"
    ],
    "distinguishing_features": [
      "Promethium has no stable isotopes.",
      "Promethium occurs naturally in the crust only in trace amounts.",
      "Promethium is produced in reactors.",
      "Promethium is named after Prometheus."
    ],
    "appearance": "A silvery metal, rarely seen in bulk; its salts glow faintly from radioactivity.",
    "visual_identification": [
      "Element 61, symbol Pm",
      "Radioactive lanthanide with no stable isotopes",
      "Neodymium and samarium are the stable neighbours"
    ],
    "physical_properties": [
      {
        "quantity": "atomic number",
        "typical_range": "61",
        "unit": "Z",
        "note": ""
      },
      {
        "quantity": "longest-lived isotope",
        "typical_range": "Pm-145, about 17.7",
        "unit": "years",
        "note": "half-life"
      },
      {
        "quantity": "melting point",
        "typical_range": "about 1042",
        "unit": "degrees C",
        "note": "estimated"
      },
      {
        "quantity": "density",
        "typical_range": "about 7.26",
        "unit": "g/cm3",
        "note": "estimated"
      }
    ],
    "families_and_kinds": [
      "isotopes from promethium-126 to promethium-163, all radioactive",
      "promethium-147 as the working isotope",
      "promethium compounds such as the chloride and oxide",
      "promethium in nuclear batteries and luminous paint"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "lanthanide",
        "why": "the series"
      },
      {
        "relation": "is a kind of",
        "target": "radioactive element",
        "why": "no stable isotopes"
      },
      {
        "relation": "is adjacent to",
        "target": "neodymium",
        "why": "element 60"
      },
      {
        "relation": "is adjacent to",
        "target": "samarium",
        "why": "element 62"
      }
    ],
    "identifiers": [
      {
        "scheme": "symbol",
        "value_or_pattern": "Pm",
        "note": ""
      },
      {
        "scheme": "CAS",
        "value_or_pattern": "7440-12-2",
        "note": ""
      }
    ],
    "standards_and_regulation": [
      "Radiation protection and radioactive source rules",
      "Transport rules for radioactive material",
      "Nuclear material licensing"
    ],
    "failure_modes_and_hazards": [
      "Radiation exposure",
      "Contamination",
      "Legacy luminous products"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Describe promethium's properties, isotopes and historical uses from reliable sources.",
        "Flag old luminous products or gauges that may contain promethium for checking by a qualified person.",
        "Track promethium sources in an inventory the agent is authorized to keep."
      ],
      "must_not": [
        "Handle, open or dismantle a promethium source or a device that contains one.",
        "Assist anyone in obtaining, extracting or concentrating promethium outside licensed use.",
        "Dispose of promethium-bearing items as ordinary waste.",
        "Tell people that legacy luminous items are safe without a measurement by a qualified person."
      ],
      "requires_human": [
        "Moving, transferring or disposing of any promethium source.",
        "Responding to suspected contamination from a damaged source."
      ]
    },
    "ethics": {
      "considerations": [
        "Radioactive sources can harm people who do not know they are there, such as scrap workers.",
        "Legacy consumer products can expose owners and collectors without their knowledge."
      ],
      "affected_parties": [
        "Workers and collectors",
        "Waste and scrap handlers",
        "Nearby residents"
      ]
    },
    "owners": {
      "steward": "The licensed holder of the source, under the national radiation protection regulator.",
      "master_systems": [
        "National registers of radioactive sources"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1809: promethium",
      "url": "https://www.wikidata.org/wiki/Q1809",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Promethium",
      "url": "https://en.wikipedia.org/wiki/Promethium",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "identify",
        "name": "Identify",
        "description": "What promethium is.",
        "rationale": "Identity.",
        "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 promethium?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about promethium or a neighbouring lanthanide?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "isotopes",
            "name": "Isotopes",
            "description": "Isotopes.",
            "findings": [
              {
                "id": "isotopes-finding",
                "name": "Isotopes",
                "description": "Isotopes.",
                "questions": [
                  {
                    "text": "Which isotopes exist, and which are longest-lived or useful?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits the specific isotope?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "source",
        "name": "Source",
        "description": "Occurrence and production.",
        "rationale": "Supply.",
        "layers": [
          {
            "id": "occurrence",
            "name": "Occurrence",
            "description": "Occurrence.",
            "findings": [
              {
                "id": "occurrence-finding",
                "name": "Occurrence",
                "description": "Occurrence.",
                "questions": [
                  {
                    "text": "Why is promethium absent from the crust, and where does it occur in trace amounts?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits nuclear fission?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "production",
            "name": "Production",
            "description": "Production.",
            "findings": [
              {
                "id": "production-finding",
                "name": "Production",
                "description": "Production.",
                "questions": [
                  {
                    "text": "How is promethium produced and separated, and who produces it, with sources?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "use",
        "name": "Use",
        "description": "Uses and safety.",
        "rationale": "Application.",
        "layers": [
          {
            "id": "uses",
            "name": "Uses",
            "description": "Uses.",
            "findings": [
              {
                "id": "uses-finding",
                "name": "Uses",
                "description": "Uses.",
                "questions": [
                  {
                    "text": "How has promethium been used in luminous paint, nuclear batteries and gauges?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits betavoltaic device?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "safety",
            "name": "Safety",
            "description": "Radiation safety.",
            "findings": [
              {
                "id": "safety-finding",
                "name": "Safety",
                "description": "Safety.",
                "questions": [
                  {
                    "text": "What radiation hazards does promethium present, and what rules apply?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the user asking about a personal exposure, which needs a specialist?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "History.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "discovery",
            "name": "Discovery",
            "description": "Discovery.",
            "findings": [
              {
                "id": "discovery-finding",
                "name": "Discovery",
                "description": "Discovery.",
                "questions": [
                  {
                    "text": "How was promethium predicted, sought and finally identified in 1945, and how was it named?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "teach",
            "name": "Teach",
            "description": "Teaching.",
            "findings": [
              {
                "id": "teach-finding",
                "name": "Teach",
                "description": "Teaching.",
                "questions": [
                  {
                    "text": "How is promethium used to teach nuclear stability and the lanthanides?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the periodic table?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should isotopes be separate entries?",
    "How should reference data be linked?",
    "The registry entry has merged aliases naming isotopes; should they be split off?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}