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  2. Learn about ionizing radiation, its sources, effects, and comparison of doses from natural and human-made sources. The Chart shows how radiation interacts with humans over six orders of magnitude and provides a user-friendly reference.

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    • Background Radiation
    • Average U.S. Doses and Sources
    • Doses from Common Radiation Sources
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    Background radiationRadiation that is always in the environment. The majority of background radiation occurs naturally and a small fraction comes from man-made elements.is present on Earth at all times. The majority of background radiation occurs naturally from minerals and a small fraction comes from man-made elements. Naturally occurring radioact...

    All of us are exposed to radiation every day, from natural sources such as minerals in the ground, and man-made sources such as medical x-rays. According to the National Council on Radiation Protection and Measurements (NCRP), the average annual radiation dose per person in the U.S. is 6.2 millisieverts (620 millirem). The pie chart below shows the...

    The following diagram compares radiation doses from common radiation sources, both natural and man-made.

    Learn about the natural and man-made sources of radiation and how they affect your dose. See a chart of radiation doses from common sources and a dose calculator.

  3. Chart visualising the range of non-lethal to lethal doses of radiation.

  4. Feb 13, 2024 · Key Points. Radiation is energy and is measured to determine a dose rate (sometimes called ambient radiation) and radiation dose (radiation you absorb). Radioactivity is a measure of the amount of radioactive material.

  5. How much radiation is delivered in tests like CT scans and x-rays? The graph below shows the range of radiation exposure a patient may receive from different medical exams. The dotted line indicates the most likely dose.

  6. Apr 26, 2022 · Learn how much radiation you receive from natural and man-made sources, such as medical procedures and food. See charts and calculators to compare different doses and sources of radiation.

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