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At the time the article was created Henry Knipe had no recorded disclosures.View Henry Knipe's current disclosures
At the time the article was last revised Travis Fahrenhorst-Jones had no financial relationships to ineligible companies to disclose.View Travis Fahrenhorst-Jones's current disclosures
Background radiation refers to exposure to ionizing radiation in day-to-day life, excluding occupational exposures. It is measured in millisieverts (mSv). Ionizing radiation occurs naturally in the environment 1,2:
radioactive gas (e.g. radon, thoron): 0.2-2.2 mSv/year
external terrestrial (e.g. building materials): 0.3-1 mSv/year
ingestion (i.e. diet): 0.2-1 mSv/year
cosmic radiation: 0.3-1 mSv/year
Geographic variables in background radiation include altitude (higher altitude results in higher cosmic radiation exposure) and percentage of radioactive gas in the atmosphere. The average background radiation is 1.5-2 mSv/year in Australia 1, 3.2 mSv/year in the United States 2, and 2.3 mSv/year in the United Kingdom 3.
Medical exposure is sometimes considered part of background radiation with average doses of 1.7 mSv (Australia) 1, and 2.7 mSv (UK) 3 to 3.0 mSv (United States) per person per year 2. These figures will vary dramatically depending on availability and technology.
- 1. "Ionising Radiation and Health." Radiation Protection. Australian Radiation Protection and Nuclear Safety Agency, 25 Sept. 2015. Web. 13 May 2017. .
- 2. Charles A. Kelsey, Philip H. Heintz, Gregory D. Chambers, Daniel J. Sandoval, Natalie L. Adolphi, Kimberly S. Paffett. Radiation Biology of Medical Imaging. ISBN: 9781118517130
- 3. Alim Yucel-Finn, Fergus Mckiddie, Sarah Prescott et al. Farr's Physics for Medical Imaging , E-Book. (2023) ISBN: 9780702083655 - Google Books