If X-ray intensity is 100 mrem/hr at 1 meter FFD, what is the intensity at 4 meters?

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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 X-ray intensity is 100 mrem/hr at 1 meter FFD, what is the intensity at 4 meters?

Explanation:
Radiation intensity falls off with the square of the distance from the source. When you increase distance by a factor of 4 (from 1 m to 4 m), the intensity drops by 4^2 = 16. So the new intensity is 100 mrem/hr divided by 16, which is 6.25 mrem/hr. This illustrates why moving farther away dramatically lowers exposure.

Radiation intensity falls off with the square of the distance from the source. When you increase distance by a factor of 4 (from 1 m to 4 m), the intensity drops by 4^2 = 16. So the new intensity is 100 mrem/hr divided by 16, which is 6.25 mrem/hr. This illustrates why moving farther away dramatically lowers exposure.

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