A CT of your abdomen is 10 mSv, or the equivalent of three years of background radiation
. A CT image of your brain produces 2 mSv of radiation, or eight months outside.
According to the United Nations Scientific Committee on Effects of Atomic Radiation report  the greatest contribution to mankind's exposure comes from natural background radiation
. The major sources responsible for exposure are naturally occuring radio nuclides in the earth's crust such as [sup.232]Th, [sup.238]U, [sup.40]K which occur in minerals such as monazites and zircons.
According to the survey, no sample product had a radiation level that largely exceeded the background radiation
level, which is the radiation present in the natural environment.
Optimism moves the quotes upwards despite the continuing warfare in Libya and the rising background radiation
A day earlier, the Foreign Ministry said that some Bulgarian embassy staff were being moved from Tokyo 1000km south to Fukuoka because of increased background radiation
. A Bulgarian Red Cross appeal had, by March 23, raised more than 90 000 leva in donations via SMS to the 1255 number.
The average human gets a dose of six millisieverts of background radiation
in a year.
Comparison of the effective doses of different radiographic procedures to levels of background radiation
(natural occurring radiation that is constantly present in the environment) provides context to understand the significance of exposure.
We are all exposed to natural background radiation
exposure from-rocks, radon, cosmic rays, food, and water.
Dr Tipler mentions the issue of background radiation
. He also makes the statement that background radiation
on the coast of Brazil exceeds 150 mSv a year.
Material is in sections on all-sky survey, solar systems, star formation, debris disks, stars, super novae and remnants, galaxies and clusters, deep space surveys, background radiation
, and future missions.
Two spots had 5000 times more radiation levels than the safe background radiation
, Greenpeace representatives said.