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Displayed background gamma radiation level is 9.8 μR/h (0.82 mSv/a) This is very close to the world average background radiation of 0.87 mSv/a from cosmic and terrestrial sources. Cloud chambers used by early researchers first detected cosmic rays and other background radiation.
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.
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.
One (1) milliRoentgen per hour (mR/h) is approximately 10,000 nanoSieverts per hour (nSv/h). EPA presents dose rate in the international unit of nanoSieverts per hour for easy comparison with international monitoring stations.
Exposure in some areas can be as high as 175 mSv per year (20μSv/h), though the average exposure for residents of the town are of course much lower. In fact, the highest level of natural background radiation on record (800mSv/yr) is on another Brazilian beach.
Typically, everybody is exposed to two milliseiverts (mSv) per year throughout our lives from natural background radiation. We might receive a dose of up 10-20mSv from diagnostic radiology -...
According to recent estimates, the average person in the U.S. receives an effective dose of about 3 mSv per year from natural radiation, which includes cosmic radiation from outer space. These natural "background doses" vary according to where you live.
space radiation is about 0.04 µSv in an hour, or about 0.33 mSv each year. This dose varies and depends on the lati-tude and altitude where a person lives. The average space radiation dose makes up about 11 percent of the average total dose from background radiation (see Resources listed at the end of this fact sheet for more information).
That is a level experts describe as minimal, and just below the global average of naturally occurring background radiation of 0.17-0.39 per hour, a range given by the World Nuclear...
The amount of background radiation at a given location depends on many factors both on Earth and from space. Natural radiation sources contribute over half of the annual radiation exposure for an average person in the United States.