SUMMARY OF MEASURED RADIOFREQUENCY ELECTRIC AND MAGNETIC-FIELDS (10 KHZ TO 30 GHZ) IN THE GENERAL AND WORK-ENVIRONMENT

We have plotted data from a number of studies on the range of radiofre quency (RF) field levels associated with a variety of environmental an d occupational sources. Field intensity is shown in units of volts/met er (V/m) for electric field strength and amps/meter (A/m) for magnetic field strength. Duty factors, modulation frequencies, and modulation indices are also reported for some sources. This paper is organized in to seven sections, each cataloging sources into appropriate RF frequen cy bands from very-low frequency (VLF) to super-high frequency (SHF), and covers frequencies from 10 kHz to 30 GHz. Sources included in this summary are the following: Coast Guard navigational transmitters, a N avy VLF transmitter, computer visual display terminals (VDTs), inducti on stoves or range tops, industrial induction and dielectric heaters, radio and television broadcast transmitters, amateur and citizens band (CB) transmitters, medical diathermy and electrosurgical units, mobil e and handheld transmitters, cordless and cellular telephones, microwa ve ovens, microwave terrestrial relay and satellite uplinks, and polic e, air traffic, and aircraft onboard radars. For the sources included in this summary, the strongest fields are found near industrial induct ion and dielectric heaters, and close to the radiating elements or tra nsmitter leads of high power antenna systems. Handheld transmitters ca n produce near fields of about 500 V/m at the antenna. Fields in the g eneral urban environment are principally associated with radio and TV broadcast services and measure about 0.1 V/m root-mean-square (rms). P eak fields from air traffic radars sampled in one urban environment we re about 10 V/m, 300 times greater than the rms value of 0.03 V/m when the duty factor associated with antenna rotation and pulsing are fact ored in. (C) 1997 Wiley-Liss, Inc.dagger.