http://www.physics.isu.edu/radinf/risk.htmDoses from various sources
Limits for Exposures Exposure Range
Occupational Dose limit (US - NRC) 5,000 mrem/year
Occupational Exposure Limits for Minors 500 mrem/year
Occupational Exposure Limits for Fetus 500 mrem
Public dose limits due to licensed activities (NRC) 100 mrem/year
Occupational Limits (eye) 15,000 mrem/year
Occupational Limits (skin) 50,000 mrem/year
Occupational Limits (extremities) 50,000 mrem/year
Source of Exposure
Average Dose to US public from All sources 360 mrem/year
Average Dose to US Public From Natural Sources 300 mrem/year
Average Dose to US Public From Medical Sources 53 mrem/year
Average dose to US Public from Weapons Fallout < 1 mrem/year
Average Dose to US Public From Nuclear Power < 0.1 mrem/year
Coal Burning Power Plant 0.165 mrem/year
X-rays from TV set (1 inch) 0.500 mrem/hour
Airplane ride (39,000 ft.) 0.500 mrem/hour
Nuclear Power Plant (normal operation at plant boundary) 0.600 mrem/year
Natural gas in home 9 mrem/year
Average Natural Background 0.008 mR/hour 0.006-0.015 mR/hour
Average US Cosmic Radiation 27 mrem/year
Average US Terrestrial Radiation 28 mrem/year
Terrestrial background (Atlantic coast) 16 mrem/year
Terrestrial background (Rocky Mountains) 40 mrem/year
Cosmic Radiation (Sea level) 26 mrem/year
Cosmic Radiation (Denver) 50 mrem/year
Background Radiation Total (East, West, Central US) 46 mrem/year 35-75 mrem/year
Background Radiation Total (Colorado Plateau) 90 mrem/year 75-140 mrem/year
Background Radiation Total (Atlantic and Gulf in US) 23 mrem/year 15-35 mrem/year
Radionuclides in the body (i.e., potassium) 39 mrem/year
Building materials (concrete) 3 mrem/year
Drinking Water 5 mrem/year
Pocket watch (radium dial) 6 mrem/year
Eyeglasses (containing thorium) 6 - 11 mrem/year
Coast to coast Airplane roundtrip 5 mrem
Chest x-ray 8 mrem 5 - 20 mrem
Extemities x-ray 1 mrem
Dental x-ray 10 mrem
Head/neck x-ray 20 mrem
Cervical Spine x-ray 22 mrem
Lumbar spinal x-rays 130 mrem
Pelvis x-ray 44 mrem
Hip x-ray 83 mrem
Shoe Fitting Fluroscope (not in use now) 170 mrem
Upper GI series 245 mrem
Lower GI series 405 mrem
Diagnostic thyroid exam (to the thyroid)
Diagnostic thyroid exam (to the Whole Body)
CT (head and body) 1,100 mrem
Therapeutic thyroid treatment (dose to the thyroid) 10,000,000 mrad
Therapeutic thyroid treatment (dose to the whole body) 7,000 mrem 5,000-15,000 mrad
Earliest Onset of Radiation Sickness 75,000 mrad
Onset of hematopoietic syndrome 300,000 mrad 100,000 to 800,000 mrad
Onset of gastrointestinal syndrome 1,000,000 mrad 500,000 to 1,200,000 mrad
Onset of cerebrovacular syndrome 10,000,000 mrad >5,000,000 mrad
Thershold for cataracts (dose to the eye) 200,000 mrad
Expected 50% death without medical attention 400,000 mrad 300,000 to 500,000 mrem
Doubling dose for genetic effects 100,000 mrad
Doubling dose for cancer 500,000 mrad (8% per Sv, natural level at 20%)
Dose for increase cancer risk of 1 in a 1,000 1,250 mrem (8% per Sv)
Consideration of theraputic abortion threshold (dose in utero) 10,000 mrem
SL1 Reactor Accident highest dose to survivor 27,000 mrem
Three Mile Island (dose at plant duration of the accident) 80 mrem