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Development of an RF near-field exposure synthesizer (10 to 40 MHz).
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHEW (NIOSH) Publication No. 76-160, 1976 Jan; :1-44
Since field strength levels in the Industrial Scientific Medical bands have not been regulated by the Federal Communication Commission, it was possible that workers operating industrial radiofrequency (RF) sources could receive a greater radiation level than those workers operating communications transmitters and other RF sources at regulated frequencies. Due to the close proximity of the workers to industrial RF power sources, high personnel exposures have been noted to occur under near field conditions. The RF synthesizer described in this report was able to simulate near field exposure conditions commonly encountered in the work environment. The report covered the design, fabrication, and testing of the complete facility. The synthesizer consisted of a balanced, parallel plate strip line to generate the desired electric field, and a single turn quadruple feed inductor placed parallel to and midway between the plates to generate the desired magnetic field. The result was a synthesizer in which the electric field and magnetic field components were able to be adjusted essentially independently over a wide range of magnitudes, phase differences, and relative spatial orientations to simulate various near field configurations.
Radiation-hazards; Electromagnetic-radiation; Radiation-exposure; Laboratory-workers; Laboratory-equipment; Equipment-design; Analytical-instruments
NTIS Accession No.
DHEW (NIOSH) Publication No. 76-160; Interagency-Agreement-Number-75-16
National Institute for Occupational Safety and Health
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division