Establishment of the response curve in terms of air kerma as a function of the energy and the angle of incidence of a BERTIN type 6150 survey meter, Calibrates in terms of air kerma and ambient dose equivalent (H*(10)) of this radiometer in a collimated photon beam from the 60-Coblat of the LNHB, Determination of the conversion factor from air kerma to ambient dose equivalent for the low flow rate beam spectrum and calculation of convolution with the response of the survey meter, Measurement of the kerma flow in the air in the low flow beam as a function of the distance from the source by applying the correction factors for the radiation scattered by the walls of the shielded enclosure. Development and testing of the calibration procedure of a commercial dosimeter. An internship report will be written by the intern at the end of their internship.