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Chemical Hazards and Reactions

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Radiation Units

Radiation Units
Name
Curie
Roentgen
Roentgen Equivalent in Man
Radiation Absorbed Dose
Symbol
Ci
R
REM
RAD
The following are the most commonly used units of radiation:
  • Curie (Ci) is a special unit for the activity of a substance which is measured in terms of disintegrations per unit time
  • Roentgen (R) is a unit for exposure that gives the number of ionizations caused by photons in air
  • REM (Roentgen Equivalent in Man) is the special unit of dose equivalent
  • RAD (Radiation Absorbed Dose) is a special unit of absorbed dose.

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