Calibration of the alanine dosimeters in the electron beams of the Gustave Roussy Flash installation, including validation of the calibration by so-called “blind” tests, Comparison between calibration in Flash beams and that carried out on standard beams (from the LNHB) Study of the dependence of the signal from alanine dosimeters as a function of energy, dose rate and delivered dose estimation of possible corrective factors, Establishment of an external quality control protocol for Flash electron beams using alanine dosimetry; An internship report will be written by the intern at the end of their internship. The start of actions will be strongly dependent on the completion of primary references on the Flash beams at Gustave Roussy during a separate project led by the LNHB and GR which should precede this study.