Where It Comes From
Natural decay of uranium and thorium creates radon gas; alpha‑emitters also occur in mining, some industries, smoke detectors (americium‑241), and certain medical uses [1][2][6].
How You Are Exposed
Mainly by breathing indoor radon and its decay products; also at mines, tunnels, and processing sites. External exposure is minimal because alpha particles don’t pass through skin [2][3][4].
Why It Matters
Internal alpha exposure increases lung cancer risk; radon is a known human carcinogen and the second leading cause of lung cancer after smoking [2][4][5].
Who Is at Risk
People in high‑radon homes, underground miners, workers handling alpha emitters, smokers (risk multiplies), and pregnant people and children (more sensitive to radiation) [2][3][4].
How to Lower Your Exposure
Test your home for radon and mitigate (ventilation, sealing, sub‑slab depressurization); follow workplace radiation controls; don’t dismantle smoke detectors; stop smoking to reduce combined risk [2][3][6].
References
- [1]CDC. Radiation Basics: Alpha Particles. https://www.cdc.gov/nceh/radiation/alpha.html
- [2]EPA. Health Risk of Radon. https://www.epa.gov/radon/health-risk-radon
- [3]ATSDR. ToxFAQs: Radon. https://www.atsdr.cdc.gov/toxfaqs/tfacts145.pdf
- [4]WHO. WHO Handbook on Indoor Radon: A Public Health Perspective. https://www.who.int/publications/i/item/9789241547673
- [5]IARC. Monographs Volume 100D: Radiation – Radon. https://publications.iarc.fr/Book-And-Report-Series/Iarc-Monographs-On-The-Identification-Of-Carcinogenic-Hazards-To-Humans/Radiation-2012
- [6]EPA. Radiation Sources: Consumer Products (Smoke Detectors/Americium‑241). https://www.epa.gov/radiation/radiation-sources-consumer-products#smoke