A coast-to-coast round-trip airline flight is about 0.03 mSv due to exposure to cosmic rays. People living at high altitudes such as Colorado or New Mexico receive about 1.5 mSv more per year than those living near sea level. These natural "background doses" vary according to where you live. receives an effective dose of about 3 mSv per year from natural radiation, which includes cosmic radiation from outer space. According to recent estimates, the average person in the U.S. We are exposed to natural sources of radiation all the time. Naturally occurring "background" radiation Effective dose allows your doctor to evaluate your risk and compare it to common, everyday sources of exposure, such as natural background radiation. If you have an x-ray exam that includes tissues or organs that are more sensitive to radiation, your effective dose will be higher. Effective dose considers how sensitive different tissues are to radiation. Risk refers to possible side effects, such as the chance of developing a cancer later in life. Other radiation dose measurement units include rad, rem, roentgen, sievert, and gray.ĭoctors use "effective dose" when they talk about the risk of radiation to the entire body. The scientific unit of measurement for whole body radiation dose, called "effective dose," is the millisievert (mSv). Radiation that passes through the body does not contribute to this dose. The amount the patient absorbs contributes to the patient's radiation dose. The x-rays that are not absorbed are used to create the image. When radiation passes through the body, some of it is absorbed.
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