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There is a mathematical relationship that describes how x-ray intensity behaves with distance.
This is known as the 1/r2 , or the "inverse square law".
For Example: At 1 meter from the scatter source, 100 mR is measured. What is the exposure at 2m?
Dividing the square of the reference distance by the square of the new distance, we get a distance correction factor of (1m)2/(2m)2 or 1/4
Dose at 2m would be: 100 mR x (1/4) = 25 mR
Distance has a strong effect on one's exposure to scattered x-rays.
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