15 Feb
2001
15 Feb
'01
3:08 p.m.
From: Ross Archer <dogbert(a)mindless.com>
By the way, ANSI has a standard for RF exposure limits.
I don't recall
As do OSHA.
the std. number offhand but it shows that certain
frequencies are likely
to
affect certain body parts, so it's not a simple
case of more dangerous
as the frequency goes higher (or lower.) For example, 1.2 Ghz is
about right for heating the vitreous fluid in the eyeball, and so
exposure
to 1.2 Ghz should always be kept away from the eyes to
prevent possible
vision damage. I think other frequencies are also bad for different
organs.
Apparently, it's the heating effect of RF that
tends to do the most
damage
until the frequency gets quite high.
The ability of RF to penetrate the body also goes down with increasing
frequency. Also at incresing frequency the ability to focus RF power
becomes easier and the antennas more compact adding to the
the risk.
All RF should be considered with care. IT's energy radiated and if
you are in a concentrated field (IE: in front of a dish antenna) then
the risks go up as compared to a diffuse field.
Allison