{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T03:49:29Z",
    "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": "2026-10-06T00:30:00Z",
      "ingestedAt": "2026-10-05T20:55:37+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T12:16:28+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q1108",
    "registryId": "vr.tr.caesium",
    "name": "caesium",
    "version": "0.2.0-wave.2",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1108/",
  "model": {
    "registry_id": "vr.tr.caesium",
    "name": "caesium",
    "purpose": "Let an agent explain caesium as an element and its properties and isotopes, describe its role in timekeeping and industry, relay radiological information on caesium-137 with reference to authorities, and decline handling or acquisition detail for radioactive sources.",
    "definition": "The chemical element with atomic number fifty-five, a soft, gold-coloured alkali metal that melts near room temperature and reacts violently with water, with one stable isotope, caesium-133, whose hyperfine transition defines the second, and radioactive isotopes such as caesium-137, a fission product of concern in nuclear accidents and used in industrial and medical sources, and caesium-135; caesium is used in atomic clocks, drilling fluids, photoelectric cells and research, and is described here without handling or acquisition detail for radioactive sources.",
    "what_it_is_for": "Element fifty-five, an alkali metal.",
    "affordances": [
      "explain the element and isotopes",
      "describe timekeeping and industrial uses",
      "relay radiological information",
      "decline source handling detail"
    ],
    "distinguishing_features": [
      "Most reactive stable metal",
      "Atomic clock standard",
      "Caesium-137 fission product",
      "Low melting point"
    ],
    "appearance": "A soft gold-coloured metal, liquid near room temperature.",
    "visual_identification": [
      "Atomic number fifty-five",
      "Defines the second through caesium-133",
      "Rubidium and francium are neighbouring alkali metals"
    ],
    "physical_properties": [
      {
        "quantity": "Melting temperature",
        "unit": "degrees Celsius",
        "typical_range": "Approximately 28.4",
        "note": "This approximate value applies to pure elemental caesium near standard atmospheric pressure."
      },
      {
        "quantity": "Boiling temperature",
        "unit": "degrees Celsius",
        "typical_range": "Approximately 671",
        "note": "This approximate value applies to pure elemental caesium at standard atmospheric pressure."
      },
      {
        "quantity": "Mass density",
        "unit": "grams per cubic centimetre",
        "typical_range": "Approximately 1.9",
        "note": "This approximate value describes solid elemental caesium near room temperature."
      }
    ],
    "families_and_kinds": [
      "caesium metal and compounds",
      "caesium-133 and the definition of the second",
      "caesium-137 and other radioisotopes",
      "caesium in drilling fluids and industry",
      "caesium in research and photoelectric devices"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "alkali metal",
        "why": "category"
      },
      {
        "relation": "is a kind of",
        "target": "light metal",
        "why": "category"
      },
      {
        "relation": "is related to",
        "target": "polonium",
        "why": "another radioactive element entry"
      },
      {
        "relation": "is related to",
        "target": "nuclear fission",
        "why": "source of caesium-137"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "SI definition of the second",
      "Radiation protection and radioactive source control",
      "Chemical safety regulations for reactive metals"
    ],
    "failure_modes_and_hazards": [
      "Providing handling or acquisition detail for radioactive sources, which must be declined",
      "Fire and explosion from reaction with water",
      "Contamination from caesium-137 releases"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Explain caesium's properties and its role in atomic clocks and the definition of the second.",
        "State that radioactive caesium sources are strictly regulated and point to radiation authorities."
      ],
      "must_not": [
        "Give information on obtaining, extracting or handling radioactive caesium sources.",
        "Assist in using radioactive material to harm people or contaminate places.",
        "Advise on handling caesium metal outside a qualified laboratory.",
        "Downplay contamination risks after a radiation incident."
      ],
      "requires_human": [
        "Any request about possessing, moving or disposing of a radioactive source."
      ]
    },
    "ethics": {
      "considerations": [
        "Lost caesium sources have caused deadly contamination in communities.",
        "Accurate information in radiation emergencies protects the public."
      ],
      "affected_parties": [
        "The public",
        "Scrap and waste workers",
        "Emergency responders"
      ]
    },
    "owners": {
      "steward": "The licensed holder of a source; nuclear regulators control possession.",
      "master_systems": [
        "National registers of licensed radioactive sources"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1108: caesium",
      "url": "https://www.wikidata.org/wiki/Q1108",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Caesium",
      "url": "https://en.wikipedia.org/wiki/Caesium",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What caesium is.",
        "rationale": "Boundaries.",
        "layers": [
          {
            "id": "element",
            "name": "Element",
            "description": "The element.",
            "findings": [
              {
                "id": "element-finding",
                "name": "Element",
                "description": "Element.",
                "questions": [
                  {
                    "text": "What are the properties, occurrence and chemistry of caesium?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the request seeking handling or acquisition detail for radioactive sources, which must be declined?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "isotopes",
            "name": "Isotopes",
            "description": "Isotopes.",
            "findings": [
              {
                "id": "isotopes-finding",
                "name": "Isotopes",
                "description": "Isotopes.",
                "questions": [
                  {
                    "text": "What isotopes of caesium exist, and why are caesium-133 and caesium-137 important?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits radioisotopes?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "use",
        "name": "Use",
        "description": "Uses.",
        "rationale": "Applications.",
        "layers": [
          {
            "id": "clocks",
            "name": "Clocks",
            "description": "Atomic clocks.",
            "findings": [
              {
                "id": "clocks-finding",
                "name": "Clocks",
                "description": "Clocks.",
                "questions": [
                  {
                    "text": "How does the caesium-133 transition define the second, and how do caesium atomic clocks work?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits atomic clocks?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "industry",
            "name": "Industry",
            "description": "Industrial uses.",
            "findings": [
              {
                "id": "industry-finding",
                "name": "Industry",
                "description": "Industry.",
                "questions": [
                  {
                    "text": "How is caesium used in drilling fluids, photoelectric devices and research?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits a specific application?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "radiological",
        "name": "Radiological",
        "description": "Caesium-137 and safety.",
        "rationale": "Authorities.",
        "layers": [
          {
            "id": "releases",
            "name": "Releases",
            "description": "Environmental releases.",
            "findings": [
              {
                "id": "releases-finding",
                "name": "Releases",
                "description": "Releases.",
                "questions": [
                  {
                    "text": "How has caesium-137 been released in nuclear accidents and tests, and how does it behave in the environment, according to authorities?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is a radiological emergency present now, requiring official instructions?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "protection",
            "name": "Protection",
            "description": "Protection.",
            "findings": [
              {
                "id": "protection-finding",
                "name": "Protection",
                "description": "Protection.",
                "questions": [
                  {
                    "text": "What do radiation protection authorities say about caesium-137 exposure and food safety?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits radiation protection?",
                    "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 caesium discovered by spectroscopy, and how did it become the time standard?",
                    "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 caesium illustrate alkali metal chemistry and metrology safely?",
                    "kind": "action"
                  },
                  {
                    "text": "Which misconceptions arise?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should caesium-137 be a separate entry?",
    "How should radiation authorities be linked?",
    "How should metrology resources be linked?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}