What is the source-to-skin distance for mobile radiography?

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Prepare for the Radiologic Technology Supervisor and Operator Exam. Study with comprehensive questions, interactive flashcards, and detailed explanations. Boost your confidence and ensure exam readiness!

Multiple Choice

What is the source-to-skin distance for mobile radiography?

Explanation:
The main idea is that in mobile radiography you must keep the X‑ray source a certain minimum distance from the patient’s skin to limit skin dose. This minimum is 12 inches (about 30 cm). The dose at the skin increases rapidly as you get closer to the source (inverse-square relationship), so staying at least 12 inches away helps keep skin exposure reasonable while still allowing practical positioning of the portable unit. Distances shorter than this would dramatically raise skin dose and aren’t acceptable, while a longer distance (like 24 inches) is fine but not the minimum requirement—the question asks for the minimum.

The main idea is that in mobile radiography you must keep the X‑ray source a certain minimum distance from the patient’s skin to limit skin dose. This minimum is 12 inches (about 30 cm). The dose at the skin increases rapidly as you get closer to the source (inverse-square relationship), so staying at least 12 inches away helps keep skin exposure reasonable while still allowing practical positioning of the portable unit. Distances shorter than this would dramatically raise skin dose and aren’t acceptable, while a longer distance (like 24 inches) is fine but not the minimum requirement—the question asks for the minimum.

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