A radiographer is exposed to a dose rate of 10 mSv/hour while standing 3 feet from the patient during c-arm procedures. What is the approximate dose rate if the radiographer stands 4 feet from the patient?

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Multiple Choice

A radiographer is exposed to a dose rate of 10 mSv/hour while standing 3 feet from the patient during c-arm procedures. What is the approximate dose rate if the radiographer stands 4 feet from the patient?

Explanation:
The dose rate from scatter falls off with the square of the distance from the source. So when you move from 3 feet to 4 feet, the rate scales by (3/4)². Calculation: 10 mSv/h × (3²/4²) = 10 × 9/16 ≈ 5.6 mSv/h. This shows why the dose rate decreases as you stand farther away. The result around 5.6 mSv/h aligns with the inverse-square relationship for a point-like scatter source.

The dose rate from scatter falls off with the square of the distance from the source. So when you move from 3 feet to 4 feet, the rate scales by (3/4)². Calculation: 10 mSv/h × (3²/4²) = 10 × 9/16 ≈ 5.6 mSv/h.

This shows why the dose rate decreases as you stand farther away. The result around 5.6 mSv/h aligns with the inverse-square relationship for a point-like scatter source.

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