Which term describes all radiation coming from the X-ray tube housing excluding the useful beam?

• A. Leakage Radiation
• B. Stray Radiation
• C. Secondary Protective Barrier
• D. Absorbed Dose

Answer: (A)

Leakage radiation is the radiation that escapes the X-ray tube housing through its shielding and seams, outside of the useful primary beam. This term specifically describes what comes out of the tube housing itself, which is what safety design and shielding aim to limit. Stray radiation is a broader idea that can include scatter from the patient or environment and isn’t limited to what leaks from the housing. Absorbed dose refers to the amount of radiation that actually deposits energy in tissue, not the source of the radiation itself. A secondary protective barrier is a protective wall or shield, not a type of radiation. So the radiation described as all radiation coming from the tube housing excluding the useful beam is leakage radiation.