Here are the results of our 2012 External Reference Dosimetry Audit (ERDA), performed as MTK ("Messtechnische Kontrolle") by PTW-Freiburg via thermoluminescent dosimeters (TLD):
All dose deviations are within ±1%, which is an excellent result.
The full report can be downloaded here (2 MB, in German).
1Note: a small error has been corrected which affects the saturation correction of Electron beams: the pulse frequency of DR 300 MU/min is 60 Hz, not 54 Hz.