International audienceNew technologies for military radars use high peak power microwaves. It is necessary to investigate the potential biological effects induced by such exposures of the staff for risk assessment. A special emitting device was developed in our laboratory in order to reproduce a 3 GHz (S-band) radar exposure on freely moving rats. Two series of animals were exposed to acute exposure (SAR 15 W/kg) and compared to shams. No effect was shown on cognitive performances. The experiment is not finished for ACTH and corticosterone blood concentration and the results will be presented at the meeting