depth of penetration of radiation into tissue is a function of
frequency with greater penetration at lower frequencies
with town radios
interference from Hydro One smart
forcing the Town of Ingersoll to replace radios linking key municipal
offices. On Monday, council gave approval to transfer $4000 from the
PG&E crossing the line on SmartMeters
media to the PG&E Web site which had stated that 39000
had been installed in
Lake County when at that point in time, only 2500 meters had actually
been installed. 2. Declaring a delay installation list that customers
can be ...
OF THE WEEK 25: REVIEW OF INTERNATIONAL MICROWAVE EXPOSURE GUIDELINES
FROM 1957 TO 1968.
13, 2011. Swanson and colleagues from the International Labour Office
(Geneva, Switzerland) and the Bureau of Occupational Safety and
Health, Public Health Services (Cincinnati, Ohio) reviewed guidelines
for microwave radiation and published their review in the American
Industrial Hygiene Association Journal, Vol. 31: 623-629 (1970).
is some information from this article. My comments appear in square
brackets. To convert from mW/cm2 to
microW/cm2 multiple by 1000.
From 1940s to 1970s the use of microwave emitting equipment had
In the United States radio frequencies (RF) from 10 to 10,000 MHz
were classified as microwave radiation, while in Europe the range was
from 300 to 300,000 MHz. [NOTE: We now use the European range to
delineate the microwave part of the radio frequency spectrum.]
By 1970, scientists recognized that parts of the body that are unable
to dissipate heat are the most vulnerable to microwave radiation.
This includes the lens of the eye (cataracts) and the reproductive
organs (sterility or degenerative changes).
Depth of penetration of radiation into tissue is a function of
frequency with greater penetration at lower frequencies.
In the United States the first guidelines were established during the
Tri-Service conference, held in 1957. Below is a quote about the
was the opinion of those participating in the Conference that there
were not sufficient data to determine safe exposure levels for each
frequency, or ranges of frequencies, within the microwave region;
therefore, a level of 10
was selected for all frequencies. The U.S. Air Force, in adopting
this exposure level in May 1958, applied it to the frequency range of
300 to 30,000 MHz and established it as a maximum permissible
exposure level, which could not be exceeded. The only factor
considered in this criterion is the power density level. Such factors
as time of exposure, ambient environmental temperatures that could
have an increased or decreased effect on the bodys thermal response,
the frequency of the microwave energy, effects of multifrequency
exposures, differing sensitivity of various body organs, and effect
of air currents on cooling the body are not considered, although they
are all recognized as factors that might affect biological response.
It was clear in 1970 that the US guidelines were somewhat arbitrary,
were based on thermal effects only, and did not include other factors
that influence biological and health consequences. This guideline has
since been lowered from 10 to 1 mW/cm2
but is still 100 to 1000 times higher than guidelines in other
more information and to download the pdf visit . ..
future as Industry Canada sees it
member sent this as well, which pertains to the 700 MHz range.
Cell Activation Syndrome
this also EHS?
Role of the Brain and Mast Cells in MCS