A radiation worker dose 5 mGy during a 10-minute fluoroscopy procedure. What dose would be expected if the time is reduced to 5 minutes?

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Multiple Choice

A radiation worker dose 5 mGy during a 10-minute fluoroscopy procedure. What dose would be expected if the time is reduced to 5 minutes?

Explanation:
The amount of dose in fluoroscopy scales with exposure time when the dose rate is constant. Here, 5 mGy were delivered over 10 minutes, so the dose rate is 0.5 mGy per minute. If the time is reduced to 5 minutes, the dose would be 0.5 mGy/min × 5 min = 2.5 mGy. In other words, halving the time with the same exposure settings halves the dose.

The amount of dose in fluoroscopy scales with exposure time when the dose rate is constant. Here, 5 mGy were delivered over 10 minutes, so the dose rate is 0.5 mGy per minute. If the time is reduced to 5 minutes, the dose would be 0.5 mGy/min × 5 min = 2.5 mGy. In other words, halving the time with the same exposure settings halves the dose.

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