Leukocyte response following simultaneous ionizing and microwave (radar) irradiation.

By R. A. E. TIIor IsoN, S. M. MICHAELSON AND J. W. HOWLAND W ITH THE INCREASED USE of microwave generating systems, some with maximum output in excess of 1 megawatt, information on the l)iobogic effect of microwaves is of importance. Microwave energies range in the radio-frequency region of the electromagnetic spectrum from 300 megacycles/sec. (Mc./sec.) up to 300,000 Me/sec. This is equivalent to a wave length range of 100 cm. down to 0.1 cm. Microwave radiation is produced by electron tubes such as klystrons, magnetrons and thyratrons, which are capable of peak plate voltages in excess of 200 kibovolts. As a result, hard x-rays, ( up to 250 KVP ) can be produced during their operation. \\Then functioning, such tubes are shielded to reduce incident x-radiation to tolerance limits. In general, electromagnetic radiation of shorter wavelengths than visible bight produces a photoelectric or an ionization effect, amid those of longer wavelengths ( infrared to radio-frequency region ) produce ii thermal effect. A potential occupational hazard among radar workers is simultaneous exposure to x-radiation and microwaves. Leukocyte changes produced by x-irradiatiomi in many amiimab species have been webb described. Leukocyte changes following microwave exposure are primarily described in rodents. During studies on the biologic effect of microwaves it was observed that x-irradiated and simultaneous microwave and x-irradiated dogs exhibited characteristic differences in leukocvte response.