Editing Radon (section)

=== Concentration scale ===
{| class="wikitable" style="margin:auto;"
|-
! Bq/m<sup>3</sup>
! pCi/L
! Occurrence example
|-
|style="color: black; background:silver; text-align:right;"| '''1'''
| ~0.027
| Radon concentration at the shores of large oceans is typically 1&nbsp;Bq/m<sup>3</sup>.
Radon trace concentration above oceans or in [[Antarctica]] can be lower than 0.1&nbsp;Bq/m<sup>3</sup>,<ref>{{Cite journal |last1=Jun |first1=Sang-Yoon |last2=Choi |first2=Jung |last3=Chambers |first3=S.D. |last4=Oh |first4=Mingi |last5=Park |first5=Sang-Jong |last6=Choi |first6=Taejin |last7=Kim |first7=Seong-Joong |last8=Williams |first8=A.G. |last9=Hong |first9=Sang-Bum |date=November 2022 |title=Seasonality of Radon-222 near the surface at King Sejong Station (62°S), Antarctic Peninsula, and the role of atmospheric circulation based on observations and CAM-Chem model |url=https://linkinghub.elsevier.com/retrieve/pii/S0013935122013251 |journal=Environmental Research |language=en |volume=214 |issue=Pt 3 |pages=113998 |doi=10.1016/j.envres.2022.113998|pmid=35940229 |bibcode=2022ER....21413998J }}</ref> with changes in radon levels being used to track foreign pollutants.<ref>{{Cite web |last=ANSTO |title=Air pollution in Antarctica |url=https://phys.org/news/2014-12-air-pollution-antarctica.html |access-date=2024-09-23 |website=phys.org |language=en}}</ref>
|-
|style="color: black; background:aqua; text-align:right;"| '''10'''
| 0.27
| Mean continental concentration in the open air: 10 to 30&nbsp;Bq/m<sup>3</sup>.
An EPA survey<ref>{{Cite journal |last=Marcinowski |first=F. |date=1992-12-01 |title=Nationwide Survey of Residential Radon Levels in the US |url=https://academic.oup.com/rpd/article-abstract/45/1-4/419/5091672?redirectedFrom=fulltext |journal=Radiation Protection Dosimetry |volume=45 |issue=1-4 |pages=419–424 |doi=10.1093/rpd/45.1-4.419 |issn=0144-8420}}</ref> of 11,000 homes across the USA found an average of 46&nbsp;Bq/m<sup>3</sup>.
|-
|style="color: black; background:lime; text-align:right;"| '''100'''
| 2.7
| Typical indoor domestic exposure. Most countries have adopted a radon concentration of 200–400&nbsp;Bq/m<sup>3</sup> for indoor air as an Action or Reference Level.<ref name="Masse-2002" /> 
|-
|style="color: black; background:yellow; text-align:right;"| '''1,000'''
| 27
| Very high radon concentrations (>1000&nbsp;Bq/m<sup>3</sup>) have been found in houses built on soils with a high uranium content and/or high permeability of the ground. If levels are 20 picocuries radon per liter of air (800&nbsp;Bq/m<sup>3</sup>) or higher, the home owner should consider some type of procedure to decrease indoor radon levels. Allowable concentrations in uranium mines are approximately 1,220&nbsp;Bq/m<sup>3</sup> (33&nbsp;pCi/L)<ref>{{cite book| title=The Mining Safety and Health Act – 30 CFR 57.0| publisher=United States Government| date=1977| url=http://www.msha.gov/30cfr/57.0.htm| access-date=2014-07-30| archive-url=https://web.archive.org/web/20140805040709/http://www.msha.gov/30cfr/57.0.htm| archive-date=2014-08-05| url-status=dead}}</ref>
|-
|style="color: black; background:orange; text-align:right;"| '''10,000'''
| 270
| The concentration in the air at the (unventilated) [[Bad Gastein#Spa and Therapy|Gastein Healing Gallery]] averages 43&nbsp;kBq/m<sup>3</sup> (about 1.2&nbsp;nCi/L) with maximal value of 160&nbsp;kBq/m<sup>3</sup> (about 4.3&nbsp;nCi/L).<ref name="zdo" />
|-
|style="color: white; background:red; text-align:right;"| '''100,000'''
| ~2700
| About 100,000&nbsp;Bq/m<sup>3</sup> (2.7&nbsp;nCi/L) was measured in Stanley Watras's basement.<ref>{{Unbulleted list citebundle|{{cite conference |url=http://wpb-radon.com/Radon_research_papers/1995%20Nashville,%20TN/1995_14_Indoor%20Radon%20Concentration%20Data--Geographic%20and%20Geologic%20Distribution,%20Captial%20District,%20NY.pdf |title=Indoor Radon Concentration Data: Its Geographic and Geologic Distribution, an Example from the Capital District, NY |first1=John J. |last1=Thomas |first2=Barbara R. |last2=Thomas |first3=Helen M. |last3=Overeynder |date=September 27–30, 1995 |conference=International Radon Symposium |conference-url=http://internationalradonsymposium.org/ |publisher=American Association of Radon Scientists and Technologists |location=Nashville, TN |access-date=2012-11-28}}|{{cite book |last1=Upfal |first1=Mark J. |last2=Johnson |first2=Christine |title=Occupational, industrial, and environmental toxicology |date=2003 |publisher=Mosby |location=St. Louis, Missouri |isbn=9780323013406 |chapter-url=http://toxicology.ws/Greenberg/Chapter%2065%20-%20Residential%20Radon.pdf |archive-url=https://web.archive.org/web/20130514202353/http://toxicology.ws/Greenberg/Chapter%2065%20-%20Residential%20Radon.pdf |url-status=dead |archive-date=2013-05-14 |edition=2nd |chapter=65 Residential Radon |editor1-first=Michael I. |editor1-last=Greenberg |editor2-first=Richard J. |editor2-last=Hamilton |editor3-first=Scott D. |editor3-last=Phillips |editor4-first=Gayla J. |editor4-last=N. N. |access-date=28 November 2012}}}}</ref>
|-
|style="background:maroon; color:white; text-align:right;"| '''1,000,000'''
| 27000
| Concentrations reaching 1,000,000&nbsp;Bq/m<sup>3</sup> can be found in unventilated uranium mines.
|-
|style="background:black; color:white; text-align:right;"| '''{{nowrap|~5.54 × 10<sup>19</sup>}}'''
|style="background:#ddd;"| {{nowrap|~1.5 × 10<sup>18</sup>}}
|style="background:#ddd;"| ''Theoretical upper limit:'' Radon gas (<sup>222</sup>Rn) at 100% concentration (1 atmosphere, 0&nbsp;°C); 1.538×10<sup>5</sup> curies/gram;<ref>[https://www.ncbi.nlm.nih.gov/books/NBK158787/ Toxicological Profile for Radon], Table 4-2 (Keith S., Doyle J. R., Harper C., et al. Toxicological Profile for Radon. Atlanta (GA): Agency for Toxic Substances and Disease Registry (US); 2012 May. 4, CHEMICAL, PHYSICAL, AND RADIOLOGICAL INFORMATION.) Retrieved 2015-06-06.</ref> 5.54×10<sup>19</sup> Bq/m<sup>3</sup>. 
|}