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  1. Dictionary
    Back·ground ra·di·a·tion

    noun

    • 1. the uniform microwave radiation remaining from the Big Bang.

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  3. en.wikipedia.org › wiki › Background_radiationBackground radiation - Wikipedia

    Background radiation is defined by the International Atomic Energy Agency as "Dose or the dose rate (or an observed measure related to the dose or dose rate) attributable to all sources other than the one (s) specified. [1] A distinction is thus made between the dose which is already in a location, which is defined here as being "background ...

  4. sciencenotes.org › what-is-background-radiationWhat Is Background Radiation? Sources and Risks

    Apr 6, 2021 · This entry was posted on April 6, 2021 by Anne Helmenstine (updated on May 14, 2024) Sources of background radiation include radon gas, buildings, rocks, food, nuclear tests, and cosmic rays. Background radiation is ionizing radiation present in the natural environment. It does not include non-ionizing radiation, like visible light or radio ...

  5. www.epa.gov › radtown › background-radiationBackground Radiation | US EPA

    Jan 23, 2024 · About Background Radiation. Background radiation is the radiation that is present in the natural environment. Natural background radiation is all around us, all of the time. It makes up over half of our yearly exposure to radiation. The amount of background radiation is different at every location. It depends on many factors, including: This ...

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  7. www.merriam-webster.com › dictionary › backgroundBackground radiation Definition & Meaning - Merriam-Webster

    Aug 28, 2023 · The meaning of BACKGROUND RADIATION is the microwave radiation pervading the universe that exhibits a corresponding blackbody temperature of 2.7 K and that is the principal evidence supporting the big bang theory —called also cosmic background radiation.

  8. www.arpansa.gov.au › what-is-background-radiationWhat is background radiation? | ARPANSA

    Radon. Radon is a naturally occurring radioactive gas, which has no smell, colour or taste. It comes from the radioactive decay of uranium and thorium, which is present in small amounts in rocks and soil. Radon is chemically inert, so it can easily escape from the ground into the air where it can be inhaled. Every breathe we take results in a ...

  9. www.ncbi.nlm.nih.gov › pmc › articlesA review on natural background radiation - PMC

    Jul 30, 2013 · Gamma radiation emitted from natural sources (background radiation) is largely due to primordial radionuclides, mainly 232 Th and 238 U series, and their decay products, as well as 40 K, which exist at trace levels in the earth's crust. Their concentrations in soil, sands, and rocks depend on the local geology of each region in the world.

  10. www.nrc.gov › glossary › background-radiationBackground radiation | NRC.gov

    The natural radiation that is always present in the environment. It includes cosmic radiation which comes from the sun and stars, terrestrial radiation which comes from the Earth, and internal radiation which exists in all living things. The typical average individual exposure in the United States from natural background sources is about 300 ...

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