IEC Technical Committee 106
(TC106) was established in 1999 to develop international standards for
the assessment of human exposure to electric, magnetic, and
electromagnetic fields. The task includes: characterization of
electromagnetic environments with regard to human exposure;
measurement methods, instrumentation and procedures; calculation
methods; assessment methods for exposure produced by specific sources
(in so far as this task is not carried out by specific IEC product
committees); basic standards for other sources; assessment of
uncertainties. It covers the frequency range of 0 Hz to 300 GHz.
Although TC106 standards may be used to assess compliance with basic
restrictions and derived limits of international safety standards and
guidelines, such as those developed by committees of the Institute of
Electrical and Electronics Engineers (IEEE) and the International
Commission on Non-Ionizing Radiation Protection (ICNIRP), TC106 does
not develop exposure limits—nor does it establish mitigation methods,
which have to be dealt with by the relevant IEC product committees.
Representatives of the national
committees of 26 countries participate on TC106; 6 additional
countries are observers. Canada is the Secretariat, the chairman is
from the USA, the secretary and assistant secretary are from Canada
and Germany, respectively. TC106 contains 5 working groups; WG1
develops standards for the measurement and calculation of electric and
magnetic fields and induced currents over the frequency range of 0 to
approximately 100 kHz (horizontal standards), WG2 develops standards
for the characterization of electric and magnetic fields from specific
devices over the same frequency range (vertical standards), WG3 and
WG4 develop horizontal and vertical standards, respectively, over the
frequency range of approximately 100 kHz to 300 GHz, and WG5 develops
generic standards (general applications and practices) over the entire
frequency range.
Within each working group are one or more project teams, each of which
is responsible for the development of a specific standard within the
scope of the working group. The WG4 project teams should be of
particular interest to CITEL, particularly PT62209 (Human
exposure to radio frequency fields from hand-held and body-mounted
wireless communication devices – Human models, instrumentation, and
procedures; Part 1: Hand-held mobile wireless communication devices,
and Part 2:Procedure to determine the SAR for two-way radios, wireless
palmtop terminals, wireless desktop terminals, and wireless body-mounted
devices including accessories and multiple transmitters in the
frequency band 30 MHz - 6 GHz.) Part 1 was published in 2005 as an
international standard (but only extends to 3 GHz), Part 2 is now in
committee draft form and expected to be published sometime during the
next two years as is the extension of Part 1 to 6 GHz.
The work of WG4
PT62232 (Determination of RF fields in the vicinity of mobile
communication base stations for the purpose of evaluating human
exposure) should also be of interest. This draft standard
describes measurement and calculation methods used
to evaluate RF fields from mobile radio base stations (RBS) with the
objective of evaluating compliance of these installations with
appropriate international standards, guidelines, and regulations that
limit human exposure to RF fields. Part 1
describes measurement methods and analytical techniques for assessing
the levels of RF fields from a single RBS with one or more antennas
used for wireless telecommunications—it does not include measurement
and computation methods for multiple RBS locations nor for other RF
transmitters that may be present at the point of observation. These
will be addressed in future parts to the standard. The standard will
enable assessments based on worst-case parameters such as maximum
radiated power during the peak of wireless transmission activity and
over an extended period of time where such maximum conditions might
occur. The objective is to provide appropriate information to
communicate to the public in order to address concerns about such
installations, and also a means for evaluating field strength to
facilitate comparison with relevant compliance
limits. Sections are included that address the selection of an
appropriate strategy based on the purpose of the survey (e.g.,
community driven, compliance), the accuracy and availability of source
data, where/when to evaluate, and based on the situation whether
measurements or calculations are appropriate. Measurement methods
(broadband, narrowband) are discussed as are computational methods
including ray-tracing, the cylindrical model, and full-wave analysis,
including the applicability, strength and weaknesses of each method.
In conclusion, IEC
TC106 develops standards for assessing human exposure to electric,
magnetic and electromagnetic fields over the frequency range of 0 Hz
to 300 GHz. The standards address products not covered by other IEC
standards and generic standards that can be used for conformity
assessment with regard to the basic restrictions and derived limits of
contemporary RF safety standards, guidelines and regulations. The
committee works closely with other international committees to ensure
harmonization. Detailed information about IEC TC106 can be found at
Internet site:
http://www.iec.ch/cgi-bin/procgi.pl/www/iecwww.p?wwwlang=E&wwwprog=TCboard.p&committee=SC&TC=106&submit=Submit
R. C. Petersen
Chairman
IEC TC106
Additional Information: Mr.
Petersen was one of the speakers at the Workshop on the
Technical and Regulatory Aspects Related to the Effects of
Electromagnetic Non-Ionizing Emissions that
CITEL organized in Lima on June 19, 2006.
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