2 ence of a wave zone or induction zone under industrial and exper- imental conditions determines the physical values used to assess the intensity of irradiation (the power flux density or the field in- tensity), the instruments used for measuring, and the experimental technique (irradiation from a distant source, in a cavity resonator, inductor, capacitor, and so on). The physical parameters eVidently also determine the biolog- ical effects of the different frequency bands. In recent decades various bands of radio waves have been extensively used in many branches of industry. The microwave...