|
|
|
A free electronic newsletter covering news and other topics for those interested in RF safety issues.
LIVE, Web-Based RF Safety Training
|
Overview The International Council on Non-Ionizing Radiation Protection (ICNIRP) standard provides a two-tier set of RF exposure limits. The ICNIRP standard is used in most European countries and is gaining acceptance in many other countries throughout the world outside of North America. The higher tier is referred to as Occupational while the more restrictive tier is referred to as General Population. The limits for the electric and magnetic field are very similar to the limits in the 1997 FCC Regulations. The differences occur in the two transition regions: between 1 MHz and 30 MHz and between 300 MHz and 2000 MHz. At the lower frequency transition, Safety Code 6 and the ICNIRP standard have variable limits from 1 MHz to 10 MHz. All the U.S. standards (IEEE, ANSI, FCC, ACGIH, and DOD) plus the NATO standard have variable limits from 3 MHz to 20 MHz. And while all the North American standards have variable limits from 300 MHz to 1500 MHz or 3000 MHz, depending on the limits in the microwave region, the ICNIRP standard has variable limits from 400 MHz to 2000 MHz. Exposure Limits The ICNIRP standard has exposure limits for electric fields and magnetic fields that are whole-body and time averaged. Exposure limits are given from DC to 300 GHz. Exposure limits for the magnetic (H) field are relaxed below 100 MHz since the exposure limits at lower frequencies are based more on electrostimulation than body heating and both induced and contact currents are related to the strength of the electric field. There are also limits for induced currents and contact currents.
Table 1 Reference Levels for Occupational Exposure to Time-Varying Electric and Magnetic Fields (unperturbed rms values)
Table 2 Reference Levels for General Public to Time-Varying Electric and Magnetic Fields (unperturbed rms values)
Table 3 Reference Levels for Time Varying Contact Currents
Table 4 Reference Levels for Current Induced in Any Limb
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Send mail to
web@rfsafetysolutions.com with
questions or comments about this web site.
|
