If the exposure rate at 2 meters from a radiation source is 18 R/min, what is the exposure rate at 5 meters?

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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

If the exposure rate at 2 meters from a radiation source is 18 R/min, what is the exposure rate at 5 meters?

Explanation:
Exposure rate from a radiation source follows the inverse square law: it decreases with the square of the distance. So you scale by the factor (d1/d2)^2. Here, the rate is 18 R/min at 2 meters, and you want it at 5 meters. Compute: R at 5 m = 18 × (2/5)^2 = 18 × (4/25) = 72/25 ≈ 2.88 R/min. That’s the exposure rate at 5 meters.

Exposure rate from a radiation source follows the inverse square law: it decreases with the square of the distance. So you scale by the factor (d1/d2)^2.

Here, the rate is 18 R/min at 2 meters, and you want it at 5 meters. Compute:

R at 5 m = 18 × (2/5)^2 = 18 × (4/25) = 72/25 ≈ 2.88 R/min.

That’s the exposure rate at 5 meters.

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