Bulg. J. Phys. vol.27 no.S3 (2000), pp. 211-214



Microorganisms Inactivation by Electron Beam Irradiation and Microwave Heating

I. Margaritescu 1, D. Martin2, D. Ighigeanu2, A. Hategan2, C. Oproiu2, E. Mateescu2, G. Craciun2, A. Ighigeanu3
1"Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
22National Institute for Lasers, Plasma and Radiation Physics, Electron Accelerators Laboratory, 111 Atomistilor St., P.O.Box-MG36, 76900 Bucharest, Romania
3Institute of Optoelectronics , P.O.Box : MG-22, 111 Atomistilor St., 76900 Bucharest, Romania
Abstract. The comparative results obtained by applying separate electron beam irradiation, separate microwave heating and combined electron beam irradiation and microwave heating (successive and simultaneous) to reduction of viable cells of Staphylococcus intermedius and Pseudomaonas aeruginosa are presented. Simultaneous irradiation results in a dramatic reduction of microorganisms than by either microwave or electron beam irradiation alone. The tests demonstrated that irradiation time and the upper limit of required absorbed dose which ensures a complete sterilization effect of the studied microorganisms could be reduced of about six times by additional use of microwave energy to electron beam irradiation. Experiments were carried out using an electron linear accelerator ALIN-10 of 6 MeV and 180 W maximum output power and a 2.45 GHz microwave source of controlled power up to 0.85 kW.

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