Dose Course 2018_Flipping book

Challenges: reference versus relative dosimetry

Reference conditions Reference dosimetry

Non reference conditions: Relative dosimetry

- Non-Uniform electron fluence distribution over the detector. VOLUME AVERAGING

- Uniform electron fluence distribution over the detector.

- Beam spectra at the reference point may differ from beam spectra at the measuring point. ENERGY DEPENDENCE; PERTURBATION FACTORS - Perturbation in electron fluence caused by the detector itself PERTURBATION FACTORS

- Beam spectra at the reference point in ref. conditions known.

- Detector of choice: Ion Chambers