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

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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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