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ActivityCurie (Ci) = 3.7 x 1010 disintegrations per second
Becquerel (Bq) = 1 disintegration/sec
Absorbed DoseGray (Gy) = 1 joule / 1 kilogram of tissue
1 Rad = 0.01 Gray
Equivalent DoseSievert (Sv) = 1 Gray of X-ray radiation, weighted for other types of radiation
1 Rem = 0.01 Sievert
Radiation Dose LimitsThe present NRC limits are 5,000 millirem (mrem) per year for radiation workers, and 100 mrem per year for members of the general public. As noted below, typical background radiation levels are about 360 mrem per year.
Background Radiation Levels
Source millirems Natural Radon 200 Other than Radon: 100 Cosmic 27 Terrestrial 28 Internal 39 Total 300 Nuclear Fuel Cycle 0.05 Consumer Products* 10 Medical Diagnostic X-rays 39 Nuclear Medicine 14 Total 53 Total about 360 mrems/year *Includes building material, television receivers, luminous watches, smoke detectors, etc. Source: National Council on Radiation Protection and Measurement (NCRP 93)There is a nice graph from the University of Michigan.
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