{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T04:21:31Z",
    "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": "2026-10-05T23:50:00Z",
      "ingestedAt": "2026-10-05T20:56:19+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:33+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q941",
    "registryId": "vr.tr.yttrium",
    "name": "yttrium",
    "version": "0.2.0-wave.2",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q941/",
  "model": {
    "registry_id": "vr.tr.yttrium",
    "name": "yttrium",
    "purpose": "Let an agent explain yttrium as an element and its properties and isotopes, describe uses in lasers, phosphors, superconductors and medicine, present supply information, and support learning.",
    "definition": "The chemical element with atomic number thirty-nine, a silvery transition metal chemically similar to the lanthanides and classified among the rare earth elements, with one stable isotope, yttrium-89, and radioactive isotopes such as yttrium-90 used in cancer therapy, obtained from rare earth ores and used in phosphors for displays and lighting, in yttrium aluminium garnet lasers, superconductors, ceramics and alloys; yttrium is named after the Swedish village of Ytterby.",
    "what_it_is_for": "Element thirty-nine, a rare earth transition metal.",
    "affordances": [
      "explain the element",
      "describe uses",
      "present supply information",
      "support learning"
    ],
    "distinguishing_features": [
      "Rare earth chemistry",
      "Phosphor and laser uses",
      "Superconductor component",
      "Medical isotope"
    ],
    "appearance": "A silvery metal.",
    "visual_identification": [
      "Atomic number thirty-nine",
      "Rare earth behaviour",
      "Scandium is its lighter congener; the lanthanides are chemically similar"
    ],
    "physical_properties": [
      {
        "quantity": "Mass density",
        "unit": "g/cm3",
        "typical_range": "Approximately 4.47",
        "note": "This approximate value applies to solid elemental yttrium near room temperature."
      },
      {
        "quantity": "Melting point",
        "unit": "degrees Celsius",
        "typical_range": "Approximately 1526",
        "note": "This approximate value applies to pure elemental yttrium at atmospheric pressure."
      },
      {
        "quantity": "Molar mass",
        "unit": "g/mol",
        "typical_range": "Approximately 88.91",
        "note": "This approximate value applies to naturally occurring yttrium."
      }
    ],
    "families_and_kinds": [
      "yttrium metal and alloys",
      "yttrium isotopes including yttrium-90",
      "yttrium oxide and phosphors",
      "yttrium aluminium garnet",
      "yttrium in superconductors and ceramics"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "light metal",
        "why": "category"
      },
      {
        "relation": "is a kind of",
        "target": "chemical element",
        "why": "category"
      },
      {
        "relation": "is related to",
        "target": "lutetium",
        "why": "another rare earth element entry"
      },
      {
        "relation": "is related to",
        "target": "rhodium",
        "why": "another metal entry"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Rare earth trade and processing regulation",
      "Radiation protection for medical isotopes",
      "Chemical safety rules"
    ],
    "failure_modes_and_hazards": [
      "Agents giving personal advice on radionuclide therapy",
      "Supply concentration",
      "Confusing yttrium with ytterbium"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Describe yttrium, its properties and uses from reliable sources.",
        "Handle and label yttrium compounds it is authorized to store according to safety data sheets.",
        "Distinguish stable yttrium-89 from radioactive yttrium-90 when discussing risks."
      ],
      "must_not": [
        "Help divert radioactive yttrium isotopes from licensed medical or research use.",
        "Advise patients on yttrium-90 therapy for their own case.",
        "Release yttrium dusts or compounds where workers may inhale them.",
        "Hide the origin of rare earth materials from unsafe or illegal mining."
      ],
      "requires_human": [
        "Handling or disposing of radioactive yttrium sources.",
        "Treatment decisions for a patient."
      ]
    },
    "ethics": {
      "considerations": [
        "Rare earth mining often harms local communities and environments.",
        "Radioactive medical isotopes need strict control to protect patients and workers."
      ],
      "affected_parties": [
        "Mining communities",
        "Patients and medical staff",
        "Workers"
      ]
    },
    "owners": {
      "steward": "The holder of each material; radiation regulators license radioactive isotopes.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q941: yttrium",
      "url": "https://www.wikidata.org/wiki/Q941",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Yttrium",
      "url": "https://en.wikipedia.org/wiki/Yttrium",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What yttrium 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 and chemistry of yttrium, and why is it grouped with the rare earths?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits rare earth elements?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "isotopes",
            "name": "Isotopes",
            "description": "Isotopes.",
            "findings": [
              {
                "id": "isotopes-finding",
                "name": "Isotopes",
                "description": "Isotopes.",
                "questions": [
                  {
                    "text": "What isotopes of yttrium exist, and why is yttrium-90 important?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits radioisotopes?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "use",
        "name": "Use",
        "description": "Uses.",
        "rationale": "Applications.",
        "layers": [
          {
            "id": "technology",
            "name": "Technology",
            "description": "Lasers, phosphors and superconductors.",
            "findings": [
              {
                "id": "technology-finding",
                "name": "Technology",
                "description": "Technology.",
                "questions": [
                  {
                    "text": "How is yttrium used in garnet lasers, display phosphors, superconductors and ceramics?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits a specific application?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "medical",
            "name": "Medical",
            "description": "Medical uses.",
            "findings": [
              {
                "id": "medical-finding",
                "name": "Medical",
                "description": "Medical.",
                "questions": [
                  {
                    "text": "How is yttrium-90 used in radionuclide therapy, in general terms?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the user asking about their own treatment, which needs a clinician?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "supply",
        "name": "Supply",
        "description": "Sources and supply.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "sources",
            "name": "Sources",
            "description": "Sources.",
            "findings": [
              {
                "id": "sources-finding",
                "name": "Sources",
                "description": "Sources.",
                "questions": [
                  {
                    "text": "Where is yttrium obtained, and how is supply organised?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits rare earth mining?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "names",
            "name": "Names",
            "description": "Ytterby elements.",
            "findings": [
              {
                "id": "names-finding",
                "name": "Names",
                "description": "Names.",
                "questions": [
                  {
                    "text": "Why are yttrium, ytterbium, terbium and erbium named after Ytterby?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits element naming?",
                    "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 yttrium discovered and isolated?",
                    "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 yttrium illustrate rare earth chemistry and materials?",
                    "kind": "action"
                  },
                  {
                    "text": "Which misconceptions arise?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should yttrium-90 be a separate entry?",
    "How should rare earth supply data be linked?",
    "How should medical guidelines be linked?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}