Abstract: A method and apparatus for real time control of the dose rate of particles or ionizing radiation, especially X-ray radiation, generated from an electron linear gun and applied to objects for various purposes. The method involves sampling continuously, using an appropriate ionization chamber having planar electrodes, placed in the field of particles or ionizing radiation, the current for collecting the load between the electrodes. Thus, the instantaneous does rate of the radiation is represented by the collecting current. Using an appropriate shielded conducting system, the collecting current is directed to an amplification and measurement circuit arranged outside of the irradiation zone. The intensities of the current are translated into dose rate values. The does rate values are then processed and/or displayed and/or recorded. The invention can be applied to the polymerization of resins of composite materials.