Background Radiation | NRC.gov

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The natural radiation that is always present in the environment. It includes cosmic radiation which comes from the sun and stars, terrestrial radiation which ... Home NRCLibraryBasicReferencesGlossary Backgroundradiation Thenaturalradiationthatisalwayspresentintheenvironment.Itincludescosmicradiationwhichcomesfromthesunandstars,terrestrialradiationwhichcomesfromtheEarth,andinternalradiationwhichexistsinalllivingthings.ThetypicalaverageindividualexposureintheUnitedStatesfromnaturalbackgroundsourcesisabout300milliremsperyear.Foradditionalinformation,seeNaturalBackgroundSourcesandDosesinOurDailyLives. PageLastReviewed/UpdatedTuesday,March09,2021



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