Which law explains why exposure decreases with distance from the X-ray source?

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Prepare for the General Core of Radiography – Limited Scope Test with interactive flashcards and multiple-choice queries. Each question features hints and clarifications, setting you up for success on your exam journey!

Multiple Choice

Which law explains why exposure decreases with distance from the X-ray source?

Explanation:
Exposure from an X-ray source falls off as you move away because the beam spreads out in three-dimensional space. This creates the inverse square relationship: intensity is inversely proportional to the square of the distance from the source (I ∝ 1/d^2). So, doubling the distance reduces exposure to one quarter, and tripling it reduces exposure to one ninth. The other options don’t describe how radiation behaves with distance—exposure would not increase with distance, and a linear or constant-ratio rule wouldn’t match the rapid drop-off seen with a spreading beam.

Exposure from an X-ray source falls off as you move away because the beam spreads out in three-dimensional space. This creates the inverse square relationship: intensity is inversely proportional to the square of the distance from the source (I ∝ 1/d^2). So, doubling the distance reduces exposure to one quarter, and tripling it reduces exposure to one ninth. The other options don’t describe how radiation behaves with distance—exposure would not increase with distance, and a linear or constant-ratio rule wouldn’t match the rapid drop-off seen with a spreading beam.

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