Radiation Dosimetry
The subfield of medical physics quantifying and measuring ionizing radiation energy deposited in human tissues or phantom materials.
Governing formula
D = dĒ / dm (Absorbed Energy per Unit Mass)
SI unit
Gy (Gray = J/kg)
In depth
Uses ionization chambers, thermoluminescent dosimeters (TLD), and radiochromic film to measure beam calibration and patient organ doses to ensure treatment plan accuracy within ±5%.
Examples in the real world
Calibrating linear accelerator output beams using water phantom ionization chambers.