There are many activities that use or involve ionising radiation in Normandy, both in terms of energy and health. The LPCCAEN has a recognised activity in the development of new beam control and dosimetry instruments and wishes to develop this activity. The laboratory wants to develop new active dosimeters over a wide range of energy, in particular the field of low energies used in medical imaging. These developments are naturally part of RIS3 in the field of innovations in biomedical science and technology.The LPCCAEN is a nuclear physics research laboratory specialised in the field of particulate and radiation detection. He is strongly involved in the development of beam control and dosimetry instruments for research, industrial and medical applications. In particular, the LPCCAEN has built a prototype active dosimeter for photons that covers the range of low energies 1-2. He invested in a small X-ray generator (50KeV) and basic spectrometry equipment to conduct this activity in the energy range from 0 to 50keV (see puma n°44589). He wants to continue his work at the spectrometry and dosimetry level for the most used photon energy range from 10keV to 2 MeV. The most delicate part of energy to be processed and for which there is so far no “commercial” active dosimeter is the field of low energies from 10keV to 150keV. In order to further develop this dosimeter, the LPCCAEN must equip itself with complementary tools at the radiation source level, spectrometry of the "source term and reference dosimeters for precise energies or precise fields of energy. The LPCCAEN must acquire: At the radiation source level: — an X-ray generator (150 kV) to properly cover the entire range from 0 to 150keV in full energy or per energy domain playing on filtering and voltage. It is also interesting from the X generator to proceed by fluorescence X to obtain specific lines.At the spectrometry level:- a spectrometer to characterise the spectra obtained for voltages, currents, collimators and filters different from the generator or for different mixtures of powders or liquids, At the dosimetry level:- a reference dosimeter to measure under special conditions of use of the X generator (fluorescence X-rays or restricted range by voltage and filtering) reference doses in order to calibrate our dosimeter. (1)EN 3002648 (A1) WO 2014128174 (A1) Dose measurement process using a radiation detector(2)FR 3002651 (A1) WO 2014128101 (A1) Gain and zero control of a photon counting device