If the radiation absorbed dose from an external source is 270 rad, 1 m from the source, what is the expected absorbed dose at 3 m from the source?
A. 270 rad
B. 140 rad
C. 68.5 rad
D. 30 rad
D
The intensity of the radiation decreases with the distance from the radiation source. This factor is known as the inverse square law. For example, the radiation dose received at a distance of 2 feet from the radiation source is only one fourth of the dose received at a distance of 1 foot from the radiation source; the dose of radiation received at 3 feet is only one ninth of the dose received at 1 foot.
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