| Secure Order | Radiation Detectors | Contact |
|
Home
Catalog Introduction Software Applications Detectors GM-10 GM-45 GM-50 GM-90 GM-180 Accessories Test Source Battery Box Coincidence Box Anti-Coincidence GMI Interface Radon Air Sampler Download Users Group Interfacing Random Numbers Safety Uses Radiation Info Specifications FAQ Articles Experiments Rad Map Links Secure Order Detectors Contact |
Radiation UnitsActivityCurie (Ci) = 3.7 x 1010 disintegrations per secondBecquerel (Bq) = 1 disintegration/sec Absorbed DoseGray (Gy) = 1 joule / 1 kilogram of tissue1 Rad = 0.01 Gray Equivalent DoseSievert (Sv) = 1 Gray of X-ray radiation, weighted for other types of radiation1 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.
|
Thinking of buying a surplus CDV-700 or 715 detector? Be sure to read our report first.