Radiation Physics & Protection · NEET PG Preparation Radiology
What is the primary mechanism responsible for image contrast degradation (fog) in conventional film-screen radiography and the main source of occupat…
Practice question from Radiation Physics & Protection (NEET PG Preparation Radiology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-A80894
What is the primary mechanism responsible for image contrast degradation (fog) in conventional film-screen radiography and the main source of occupational radiation exposure during fluoroscopy?
- A.Coherent (Rayleigh) scattering
- B.Compton scatteringCorrect answer
- C.Photoelectric absorption
- D.Pair production
Solution
Compton scattering involves interaction with outer-shell electrons where the incident photon loses partial energy and changes direction (scatter). Scatter radiation reaching the image receptor reduces contrast (fog) and constitutes the primary source of radiation dose to personnel standing near the patient during fluoroscopy.
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