What is the minimum source-to-skin distance for a mobile x-ray unit?

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Multiple Choice

What is the minimum source-to-skin distance for a mobile x-ray unit?

Explanation:
The minimum source-to-skin distance for a mobile x-ray unit is 12 inches. This distance helps keep the patient’s skin dose within safe limits because radiation dose decreases with distance from the source (inverse square law). It also accounts for the practical setup of portable equipment, giving space for the tube housing, cables, and any needed shielding or immobilization devices between the beam and the patient when required. Distances shorter than 12 inches would produce a much higher skin dose and are not permitted. You can image with the tube farther away, but 12 inches is the smallest distance allowed.

The minimum source-to-skin distance for a mobile x-ray unit is 12 inches. This distance helps keep the patient’s skin dose within safe limits because radiation dose decreases with distance from the source (inverse square law). It also accounts for the practical setup of portable equipment, giving space for the tube housing, cables, and any needed shielding or immobilization devices between the beam and the patient when required. Distances shorter than 12 inches would produce a much higher skin dose and are not permitted. You can image with the tube farther away, but 12 inches is the smallest distance allowed.

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