The results of antibacterial irradiator efficiency re-search are adduced in this paper. The "plasma focus" formed at an end face of coaxial plasma accelerator at the discharge in an atmosphere is a source of powerful ultra-violet radiation in this irradiator.

Antibacterial processing efficiency can be increased by the designing of combined UV and microwave radiation source. It was shown that simultaneous action of pulse UV radiation and pulse nanosec microwave radiation at 600 MHz and 1200 MHz allow to increase the efficiency of antibacterial processing.