The AQA A-level Physics Paper 3B (June 2023), Option B (Medical Physics), explores radiation therapy, vision resolution, and auditory analysis. Topics include beta and gamma radiation in brachytherapy, electrophoretic screen resolution, and spectral response of cones in the human eye. Questions involve calculating pixel densities, analyzing sound intensity ratios, and evaluating kidney ultrasound imaging. The paper emphasizes practical applications of medical imaging techniques, including X-ray half-value thickness, ECG interpretation, and backing gel properties for diagnostics. Keywords: AQA Physics, medical physics, brachytherapy, ultrasound, sound intensity, X-ray imaging, electrophoretic screens, ECG.