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Before discussing these limits, we need to understand more about the measurement of radiation.
Exposure is a measure of the ability of radiation to ionize air. We measure this in Roentgens and milli-Roentgens.
Absorbed Dose is a measure of the amount of energy per unit mass deposited in a material due to exposure to ionizing radiation
Effective or Equivalent Dose is a measure of the harm to biologic systems as a result of exposure to ionizing radiation.
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