Welcome back to the RadOnc Smart Review Physics Series! In P7a, we established the concept of Exposure, detailed the ionization chamber, and learned how the f-factor converts exposure-in-air to dose-in-medium. But how can we be sure that measuring ionization in that tiny air cavity inside our water phantom accurately tells us the dose in the water? That's the focus of the first part of Episode P7b: Bragg-Gray Theory & The Dosimetry Toolkit. We'll unravel this fundamental theory and then survey the rest of the physicist's toolkit – the various detectors beyond the ion chamber used for different measurement tasks.

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