This is our final episode focused purely on calculations! We've journeyed from basic decay to complex Monitor Unit calculations. Today, we hit the advanced scenarios: What happens when the beam hits lung or bone? How do we compare radically different fractionation schemes biologically? How does modern brachytherapy dosimetry really work with TG 43? And finally, the essential math for keeping everyone safe from radiation. Today, we’re calculating radiological path length, BED and EQD 2, applying the TG 43 framework with Air Kerma Strength, and ensuring our shielding calculations meet regulatory limits.