Editing Polonium (section)

===Long term (chronic) effects===
In addition to the acute effects, radiation exposure (both internal and external) carries a long-term risk of death from cancer of 5–10% per Sv.<ref name="pnl" /> The general population is exposed to small amounts of polonium as a [[radon]] daughter in indoor air; the isotopes <sup>214</sup>Po and <sup>218</sup>Po are thought to cause the majority<ref>{{cite book| title = Health Risks of Radon and Other Internally Deposited Alpha-Emitters: BEIR IV|isbn=978-0-309-03789-1|page =5|publisher=National Academy Press|date=1988}}</ref> of the estimated 15,000–22,000 lung cancer deaths in the US every year that have been attributed to indoor radon.<ref>{{cite book| url =http://newton.nap.edu/html/beir6/ | archive-url =https://web.archive.org/web/20060919054314/http://newton.nap.edu/html/beir6/ | archive-date =2006-09-19 |title = Health Effects of Exposure to Indoor Radon| publisher=National Academy Press|place=Washington|date=1999}}</ref> [[Tobacco smoking#Health risks of smoking|Tobacco smoking]] causes additional exposure to polonium.<ref>{{cite web| url =https://www.straightdope.com/21343841/does-smoking-organically-grown-tobacco-lower-the-chance-of-lung-cancer |title =The Straight Dope: Does smoking organically grown tobacco lower the chance of lung cancer?| access-date = 2020-10-11|date =2007-09-28}}</ref>