Radiopharmaceuticals combine a radionuclide with a biologically active compound to enable functional imaging or targeted therapy. Their behaviour depends on both nuclear physics and pharmacokinetics.

This section covers radiolabelling, biodistribution, targeting mechanisms, specific activity, radiochemical purity, and factors influencing organ uptake. Understanding these principles is critical for image interpretation and radiation safety.

Exam questions frequently test mechanisms of tracer localisation, factors affecting uptake, and the distinction between physical decay and biological clearance.

The questions in this section integrate nuclear physics with physiology, reinforcing the link between radiotracer design and clinical imaging outcomes.

Get access to over 2,000 board-level radiology physics questions with highly detailed explanations, structured feedback, and exam-focused learning tools. Explore the complete question bank here.