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We demonstrate that in the accelerator g therapy there is an undesirable neutron contamination due to the nuclear reactions (g,n) type at energies of the gamma radiation higher than 10 MeV, increasing the total biological dose. This paper presents and discusses the results of the dose rate measurements in the case of gamma irradiation and that of neutron produced in different position chosen near the treatment room for both medical accelerators “Saturne 41” and “Primus”. Using a Neutron Detector FHT 757, designed to successive measure the neutron and gamma radiation the measurements were made during the patients irradiation, in the intention to obtain values as close to reality.