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Here are some approximate comparisons of background radiation and effective radiation dose in adults for several radiology procedures described on this website. These values can vary greatly, depending on the size of the patient and the type of imaging technology being used.
A person's radiation exposure due to all natural sources amounts on average to about 2.4 millisievert (mSv) per year. A sievert (Sv) is a unit of effective dose of radiation. Depending on...
Exposure to very high doses of ionizing radiation, given at a fast rate (seconds to minutes) causes damage to living tissue that may not be repaired. Depending on the total dose, high dose rate exposure can result in higher risk of cancer over a lifetime, radiation sickness, or even death.
Radiation Dose to Adults From Common Imaging Examinations. For the most current information, visit radiologyinfo.org. 05.22. Note: This chart simplifies a highly complex topic for patients’ informational use. The effective doses are typical values for an average-sized adult.
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) millirem). The pie chart below shows the sources of this average dose.
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. Hover over any of the bars to learn more.
The Chart provides a user-friendly reference for comparison of radiation exposures of interest to scientists and the public, illustrating how ionizing radiation interacts with humans over six orders of magnitude.
On average, Americans receive a radiation dose of about 0.62 rem (620 millirem) each year. Half of this dose comes from natural background radiation. Most of this background exposure comes from radon in the air, with smaller amounts from cosmic rays and the Earth itself. (The chart to the right shows these radiation doses in perspective.)
The radiation hazard scale is intended to communicate relative hazards to populations under emergency conditions when exact radiation exposure parameters for specific individuals are not available. Note that. There are no sharp lines separating radiation hazard categories.
Estimate your yearly dose from the most common sources of ionizing radiation with this interactive online dose calculator. Cosmic Radiation. Cosmic radiation comes from extremely energetic particles from the sun and stars that enter Earth’s atmosphere.