{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T03:07:45Z",
    "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": 2,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T23:55:00Z",
      "ingestedAt": "2026-10-05T20:54:55+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "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-Q1857",
    "registryId": "vr.tr.lutetium",
    "name": "lutetium",
    "version": "0.2.0-wave.2",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1857/",
  "model": {
    "registry_id": "vr.tr.lutetium",
    "name": "lutetium",
    "purpose": "Let an agent explain lutetium as an element and its properties, describe uses including medical isotopes and scintillators, explain its role in geochronology, and support learning.",
    "definition": "The chemical element with atomic number seventy-one, the last of the lanthanide series, a silvery-white rare earth metal that is among the scarcest and most expensive of the rare earths, with one stable and one very long-lived isotope used in dating, and radioactive isotopes such as lutetium-177 used in targeted radionuclide therapy; lutetium is used in catalysts, scintillator crystals for medical imaging and research, and is obtained from rare earth ores.",
    "what_it_is_for": "Element seventy-one, the last lanthanide.",
    "affordances": [
      "explain the element",
      "describe uses",
      "explain dating use",
      "support learning"
    ],
    "distinguishing_features": [
      "Rarest stable rare earth",
      "Lutetium-hafnium dating",
      "Medical isotope",
      "Scintillator use"
    ],
    "appearance": "A silvery-white metal.",
    "visual_identification": [
      "Atomic number seventy-one",
      "Last lanthanide",
      "Ytterbium precedes it; hafnium follows it"
    ],
    "physical_properties": [
      {
        "quantity": "Mass density",
        "unit": "g/cm3",
        "typical_range": "About 9.84",
        "note": "This approximate value applies to solid lutetium near room temperature."
      },
      {
        "quantity": "Melting temperature",
        "unit": "degrees Celsius",
        "typical_range": "About 1663",
        "note": "This approximate value applies to pure lutetium at atmospheric pressure."
      },
      {
        "quantity": "Boiling temperature",
        "unit": "degrees Celsius",
        "typical_range": "About 3402",
        "note": "This approximate value applies to pure lutetium at atmospheric pressure."
      }
    ],
    "families_and_kinds": [
      "lutetium metal and compounds",
      "lutetium isotopes including lutetium-176 and lutetium-177",
      "lutetium-based scintillators",
      "lutetium in radionuclide therapy",
      "lutetium in geochronology"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "lanthanide",
        "why": "category"
      },
      {
        "relation": "is a kind of",
        "target": "chemical element",
        "why": "category"
      },
      {
        "relation": "is related to",
        "target": "iridium",
        "why": "another element entry"
      },
      {
        "relation": "is related to",
        "target": "tantalum",
        "why": "another metal entry"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Radiation protection rules for medical isotopes",
      "Rare earth trade and processing regulation",
      "Chemical nomenclature"
    ],
    "failure_modes_and_hazards": [
      "Agents giving personal advice on radionuclide therapy",
      "Confusing lutetium with other rare earths",
      "Supply concentration"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Explain lutetium's properties, isotopes and uses in catalysis, scintillators and medicine.",
        "Report published information on supply and recycling."
      ],
      "must_not": [
        "Describe a radiopharmaceutical treatment as suitable for a specific patient.",
        "Help divert medical radioisotopes from licensed control.",
        "Misrepresent the purity or origin of rare earths for sale."
      ],
      "requires_human": [
        "Any decision on a patient's nuclear medicine treatment."
      ]
    },
    "ethics": {
      "considerations": [
        "Rare earth extraction carries environmental harm for nearby communities.",
        "Radioligand treatments raise hopes; information must be honest about evidence."
      ],
      "affected_parties": [
        "Patients",
        "Mining communities",
        "Nuclear medicine workers"
      ]
    },
    "owners": {
      "steward": "Nobody owns the element; holders answer for their material and radiation regulators license isotopes.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1857: lutetium",
      "url": "https://www.wikidata.org/wiki/Q1857",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Lutetium",
      "url": "https://en.wikipedia.org/wiki/Lutetium",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What lutetium is.",
        "rationale": "Chemistry.",
        "layers": [
          {
            "id": "element",
            "name": "Element",
            "description": "The element.",
            "findings": [
              {
                "id": "element-finding",
                "name": "Element",
                "description": "Element.",
                "questions": [
                  {
                    "text": "What are the properties of lutetium, and how does it fit the lanthanide series?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits lanthanides?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "isotopes",
            "name": "Isotopes",
            "description": "Isotopes.",
            "findings": [
              {
                "id": "isotopes-finding",
                "name": "Isotopes",
                "description": "Isotopes.",
                "questions": [
                  {
                    "text": "What isotopes of lutetium exist, and why are lutetium-176 and lutetium-177 important?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits radioisotopes?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "use",
        "name": "Use",
        "description": "Uses.",
        "rationale": "Applications.",
        "layers": [
          {
            "id": "medical",
            "name": "Medical",
            "description": "Medical uses.",
            "findings": [
              {
                "id": "medical-finding",
                "name": "Medical",
                "description": "Medical.",
                "questions": [
                  {
                    "text": "How is lutetium-177 used in targeted radionuclide therapy, and how are scintillators used in imaging, in general terms?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the user asking about their own treatment, which needs a clinician?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "other",
            "name": "Other",
            "description": "Other uses.",
            "findings": [
              {
                "id": "other-finding",
                "name": "Other",
                "description": "Other.",
                "questions": [
                  {
                    "text": "How is lutetium used in catalysts, research and technology?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits a specific application?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "science",
        "name": "Science",
        "description": "Geochronology and supply.",
        "rationale": "Earth science.",
        "layers": [
          {
            "id": "dating",
            "name": "Dating",
            "description": "Lutetium-hafnium dating.",
            "findings": [
              {
                "id": "dating-finding",
                "name": "Dating",
                "description": "Dating.",
                "questions": [
                  {
                    "text": "How does lutetium-hafnium dating work, and what does it reveal?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits radiometric dating?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "supply",
            "name": "Supply",
            "description": "Sources and supply.",
            "findings": [
              {
                "id": "supply-finding",
                "name": "Supply",
                "description": "Supply.",
                "questions": [
                  {
                    "text": "Where is lutetium obtained, and why is it scarce and expensive?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits rare earth elements?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "learn",
        "name": "Learn",
        "description": "History and teaching.",
        "rationale": "Education.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "History.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How was lutetium discovered, and how was its naming disputed?",
                    "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 can lutetium illustrate rare earth chemistry?",
                    "kind": "action"
                  },
                  {
                    "text": "Which misconceptions arise?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should lutetium-177 be a separate entry?",
    "How should medical guidelines be linked?",
    "How should rare earth supply data be linked?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}