{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T19:36:31Z",
    "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": 3,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T00:10:00Z",
      "ingestedAt": "2026-10-05T20:55:03+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-Q1133",
    "registryId": "vr.tr.radon",
    "name": "radon",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1133/",
  "model": {
    "registry_id": "vr.tr.radon",
    "name": "radon",
    "purpose": "Let an agent explain what radon is and where it comes from, relay measurement, reference levels and mitigation guidance from radiation protection and health authorities, and route questions about a specific building or diagnosis to qualified services.",
    "definition": "A radioactive noble gas, chemical element 86, formed by the decay of radium in uranium- and thorium-bearing rocks and soils; colourless and odourless, it seeps into buildings and accumulates indoors, and its decay products are the second leading cause of lung cancer after smoking according to health authorities.",
    "what_it_is_for": "Not for anything in ordinary life; used in some research and historically in radiotherapy sources.",
    "affordances": [
      "explain sources and behaviour of radon",
      "relay reference levels and measurement methods",
      "relay mitigation guidance from authorities",
      "route building or health questions to services"
    ],
    "distinguishing_features": [
      "Noble gas, chemically inert",
      "Radioactive, from the uranium and thorium decay chains",
      "Enters buildings from the ground and accumulates indoors",
      "Health risk is from inhaled decay products"
    ],
    "appearance": "Invisible and odourless gas; detected only by instruments.",
    "visual_identification": [
      "Detected by passive detectors or electronic monitors over days to months",
      "Concentration reported in becquerels per cubic metre",
      "Carbon monoxide and other indoor gases are different hazards"
    ],
    "physical_properties": [
      {
        "quantity": "atomic number",
        "typical_range": "86",
        "unit": "",
        "note": ""
      },
      {
        "quantity": "half-life of radon-222",
        "typical_range": "3.8",
        "unit": "days",
        "note": ""
      },
      {
        "quantity": "reference level",
        "typical_range": "100-300",
        "unit": "Bq per cubic metre",
        "note": "WHO recommends 100 where possible; many countries use 200 or 300"
      },
      {
        "quantity": "density",
        "typical_range": "about 9.7",
        "unit": "kg per cubic metre",
        "note": "heavier than air"
      }
    ],
    "families_and_kinds": [
      "radon-222 from the uranium chain, the main indoor isotope",
      "radon-220 or thoron from the thorium chain",
      "radon in groundwater and well water",
      "radon in mines and underground workplaces"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "noble gas",
        "why": "group 18 element"
      },
      {
        "relation": "is produced by",
        "target": "radium",
        "why": "its parent nuclide"
      },
      {
        "relation": "is regulated by",
        "target": "radiation protection authority",
        "why": "reference levels and workplace rules"
      },
      {
        "relation": "is related to",
        "target": "lung cancer",
        "why": "the health effect that drives regulation"
      }
    ],
    "identifiers": [
      {
        "scheme": "chemical symbol",
        "value_or_pattern": "Rn",
        "note": ""
      },
      {
        "scheme": "CAS number",
        "value_or_pattern": "10043-92-2",
        "note": ""
      },
      {
        "scheme": "isotopes",
        "value_or_pattern": "Rn-222, Rn-220, Rn-219",
        "note": "naturally occurring"
      }
    ],
    "standards_and_regulation": [
      "WHO Handbook on Indoor Radon reference level",
      "ICRP recommendations and IAEA safety standards",
      "EU Basic Safety Standards Directive radon provisions and national radon action plans",
      "Building code radon protection measures in affected areas"
    ],
    "failure_modes_and_hazards": [
      "Long-term exposure raising lung cancer risk, sharply higher for smokers",
      "Unmeasured accumulation in basements and ground floors",
      "Short-term tests misrepresenting annual average",
      "Occupational exposure in mines and underground workplaces"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Explain radon, its sources and its link to lung cancer.",
        "Report radon maps and testing advice from official agencies.",
        "Recommend that people test their homes in radon-prone areas."
      ],
      "must_not": [
        "Dismiss radon as harmless.",
        "Interpret a home measurement as safe or dangerous without the official reference level.",
        "Sell or promote unproven radon cures or products.",
        "Conceal known high radon from tenants or buyers."
      ],
      "requires_human": [
        "Remediation of a building and its effect on occupants."
      ]
    },
    "ethics": {
      "considerations": [
        "Radon is a leading cause of lung cancer among people who never smoked.",
        "Tenants may be exposed without knowing."
      ],
      "affected_parties": [
        "Residents",
        "Tenants",
        "Underground workers"
      ]
    },
    "owners": {
      "steward": "Nobody: a natural element; building owners answer for indoor levels and radiation agencies give guidance.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1133: radon",
      "url": "https://www.wikidata.org/wiki/Q1133",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Radon",
      "url": "https://en.wikipedia.org/wiki/Radon",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What radon is.",
        "rationale": "Physics and origin.",
        "layers": [
          {
            "id": "element",
            "name": "Element",
            "description": "The element.",
            "findings": [
              {
                "id": "element-finding",
                "name": "Element",
                "description": "Element.",
                "questions": [
                  {
                    "text": "What is radon, where does it come from and how does it decay?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about radon gas or about another indoor pollutant?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "behaviour",
            "name": "Behaviour",
            "description": "Indoor behaviour.",
            "findings": [
              {
                "id": "behaviour-finding",
                "name": "Behaviour",
                "description": "Behaviour.",
                "questions": [
                  {
                    "text": "How does radon enter and accumulate in buildings, and what affects concentration?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits building ventilation?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "measure",
        "name": "Measure",
        "description": "Testing.",
        "rationale": "Measurement is the only way to know.",
        "layers": [
          {
            "id": "methods",
            "name": "Methods",
            "description": "Detectors and duration.",
            "findings": [
              {
                "id": "methods-finding",
                "name": "Methods",
                "description": "Methods.",
                "questions": [
                  {
                    "text": "How is radon measured, over what period, and in which units?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which certified services provide testing in the area?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "levels",
            "name": "Levels",
            "description": "Reference levels.",
            "findings": [
              {
                "id": "levels-finding",
                "name": "Levels",
                "description": "Levels.",
                "questions": [
                  {
                    "text": "What reference levels do WHO and the national authority set, and how do results compare?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Where is the national radon map published?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "protect",
        "name": "Protect",
        "description": "Health and mitigation.",
        "rationale": "Risk can be reduced.",
        "layers": [
          {
            "id": "health",
            "name": "Health",
            "description": "Health effects.",
            "findings": [
              {
                "id": "health-finding",
                "name": "Health",
                "description": "Health.",
                "questions": [
                  {
                    "text": "What do health authorities say about radon and lung cancer risk, including for smokers?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the user asking about their own health, which needs a clinician?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "mitigation",
            "name": "Mitigation",
            "description": "Reducing levels.",
            "findings": [
              {
                "id": "mitigation-finding",
                "name": "Mitigation",
                "description": "Mitigation.",
                "questions": [
                  {
                    "text": "What mitigation measures do authorities describe, such as sub-slab depressurisation and sealing?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the question about a specific building, which needs a qualified contractor?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "rules",
        "name": "Rules",
        "description": "Regulation and workplaces.",
        "rationale": "Radon is regulated.",
        "layers": [
          {
            "id": "regulation",
            "name": "Regulation",
            "description": "Law and standards.",
            "findings": [
              {
                "id": "regulation-finding",
                "name": "Regulation",
                "description": "Regulation.",
                "questions": [
                  {
                    "text": "Which laws, directives and building codes address radon, and what do they require?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits radiation protection generally?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "workplace",
            "name": "Workplace",
            "description": "Occupational exposure.",
            "findings": [
              {
                "id": "workplace-finding",
                "name": "Workplace",
                "description": "Workplace.",
                "questions": [
                  {
                    "text": "What rules apply to radon in mines, tunnels and other workplaces?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should radon isotopes be separate entries?",
    "How should national radon maps be linked?",
    "The registry entry has merged aliases for individual isotopes; should they be split off?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}