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The 7:10 Rule of Thumb:

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Question: The 7:10 Rule of Thumb

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  1.  Is 100 percent accurate
  2.  Helps estimate future exposure levels
  3.  Is more reliable than radiological survey instrument readings
  4.  Is accurate to within +10 percent

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2. Helps estimate future exposure levels

The 7:10 Rule of Thumb helps estimate future exposure levels.

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