radon
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.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
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.
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.
It can be 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
What it looks like
Invisible and odourless gas; detected only by instruments.
Physical character
atomic number: 86
half-life of radon-222: 3.8 days
reference level: 100-300 Bq per cubic metre - WHO recommends 100 where possible; many countries use 200 or 300
density: about 9.7 kg per cubic metre - heavier than air
How it is recognised
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
Related models
is a kind of - group 18 element
is produced by - its parent nuclide
is regulated by - reference levels and workplace rules
is related to - the health effect that drives regulation
In practice
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
Identifiers
chemical symbol Rn
CAS number 10043-92-2
isotopes Rn-222, Rn-220, Rn-219 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
Also called
+11
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.radon
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What radon is.
Physics and origin.
Element
The element.
Element
Element.
- What is radon, where does it come from and how does it decay? definition
- Is the question about radon gas or about another indoor pollutant? boundary
Behaviour
Indoor behaviour.
Behaviour
Behaviour.
- How does radon enter and accumulate in buildings, and what affects concentration? definition
- Which entry fits building ventilation? action
Measure Testing.
Measurement is the only way to know.
Methods
Detectors and duration.
Methods
Methods.
- How is radon measured, over what period, and in which units? measurement
- Which certified services provide testing in the area? action
Levels
Reference levels.
Levels
Levels.
- What reference levels do WHO and the national authority set, and how do results compare? measurement
- Where is the national radon map published? provenance
Protect Health and mitigation.
Risk can be reduced.
Health
Health effects.
Health
Health.
- What do health authorities say about radon and lung cancer risk, including for smokers? provenance
- Is the user asking about their own health, which needs a clinician? boundary
Mitigation
Reducing levels.
Mitigation
Mitigation.
- What mitigation measures do authorities describe, such as sub-slab depressurisation and sealing? provenance
- Is the question about a specific building, which needs a qualified contractor? boundary
Rules Regulation and workplaces.
Radon is regulated.
Regulation
Law and standards.
Regulation
Regulation.
- Which laws, directives and building codes address radon, and what do they require? provenance
- Which entry fits radiation protection generally? action
Workplace
Occupational exposure.
Workplace
Workplace.
- What rules apply to radon in mines, tunnels and other workplaces? provenance
- Which references are standard? provenance
What the second pass must settle
- 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?