1.2
Maximum RF Power Density Limits
The RF Radiation Power Density limit figure recommended by RF Central is based upon guideline
levels published in:
a.
IEEE standard C95.1 1999 - IEEE Standard for Safety Levels with respect to Human Exposure
to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz.
b.
Guidelines for Limiting Exposure to Time-varying Electric, Magnetic & Electromagnetic Fields
(up to 300 GHz) published in 1998 by the Secretariat of the International Commission on Non-Ionizing
Radiation Protection (ICNIRP).
Both documents define guideline RF power density limits for "Controlled" and "Uncontrolled"
environments. An uncontrolled environment is defined as one in which the person subjected to the RF
radiation may be unaware of and has no control over the radiation energy received. The uncontrolled
environment conditions can arise, even in the best-regulated operations and for this reason the limits
defined for the uncontrolled environment have been assumed for the RF Central recommended limit.
Documents a) and b) also show the RF power density guidelines to be frequency dependent. Different
power density / frequency characteristics are presented in the two documents. To avoid complexity
and to avoid areas of uncertainty, RF Central recommends the use of a single power density limit
across the frequency range 100 kHz to 300 GHz. The 1w/m² power density limit we recommend
satisfies the most stringent of the guidelines published to date.
Footnote:
The IICNIRP document may be freely downloaded from the internet at
www.icnirp.de/documents/emfgdl.pdf
(PDF file).
Issue Status
Issue Date
Changes
Issue 1.0
November 2005
First Issue
Issue 1.1
May 2006
Update
Issue 2.0
December 2006
Update: New Model
RFX-NLL
Issue 2.0
page 5 of
20