If the distance from the X-ray source is doubled, the exposure rate becomes what fraction of the original?

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Enhance your skills for the Radiologic Technology Supervisor and Operator Test. Study effectively with multiple choice questions, each supported by explanations and hints to ensure you're fully prepared!

Multiple Choice

If the distance from the X-ray source is doubled, the exposure rate becomes what fraction of the original?

Explanation:
Exposure rate from an X-ray source follows the inverse square relationship: it is proportional to 1 over the distance squared. If you double the distance, the exposure rate becomes (1/(2d)^2) = 1/4 of the original. So the exposure rate is reduced to one quarter of its initial value. In practice, increasing distance greatly reduces exposure at a point, and to maintain the same receptor exposure you would need to increase tube current or exposure time accordingly.

Exposure rate from an X-ray source follows the inverse square relationship: it is proportional to 1 over the distance squared. If you double the distance, the exposure rate becomes (1/(2d)^2) = 1/4 of the original. So the exposure rate is reduced to one quarter of its initial value. In practice, increasing distance greatly reduces exposure at a point, and to maintain the same receptor exposure you would need to increase tube current or exposure time accordingly.

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