Need for Standardization

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  • It takes between 200-400 rad to cause SED.
  • The SED varied from lab to lab because individuals react differently to exposure. Darker pigmentation in the skin meant it took a higher dose to cause one SED.
  • The first limits for exposure were based on receiving one SED per day, then per week, then per month. The limit became stricter as workers started showing illnesses and conditions associated with radiation exposure.
  • Because of the importance of having accurate standards, radiation workers developed devices for measuring exposure.
  • One of the first measurement tools developed was the ion chamber.


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