When working in a radiation area, the dose received is decreased by three principal means: shielding the radiation source, minimizing the time in the radiation area, and increasing the distance from the radiation source. The exposure rate in an area decreases by the square of the distance from the source. This concept is referred to as the inverse square law and is a very effective technique of dose reduction. For example, increasing the distance from the source by a factor of 4 decreased the exposure rate by a factor of 16.
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