Sophist888@aol.com
Wed, 31 Mar 1999 13:22:00 EST
From: Sophist888@aol.com Date: Wed, 31 Mar 1999 13:22:00 EST Subject: Re: IFETS-DISCUSS Digest - 30 Mar 1999 to 31 Mar 1999
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Vilnis Vulfs writes:
<< The configuration of computers in school labs has been an interest of mine.
I have heard that most (90%) of the radiation emitted from monitors is
emitted from the back. If this is true, a circular configuration might
increase radiation exposure. Does anybody have any good research on the
topic of radiation emission from computers?
Vilnis Vulfs
Senior Instructional Designer
Kelly Services >>
Vilnis,
Cathode ray tubes (CRTs) work by shooting an electron beam from the back to
the surface of the tube. Most emission is of the X-Ray variety and comes out
the front. Manufacturers have known this for years and have taken many
precautions in the design of CRTs to limit exposure. These include the
incorporation of leaded glass into the back of the CRT's viewing surface. The
emitted radiation is measured as a standard part of quality control and unsafe
tubes are not used in production. As with television, the greatest danger of
exposure to the miniscule amount of X-Ray radiation that does come through the
front, will occur closer to the surface. So the best protection for computer
users who generally sit close to the screen is an ergonomically designed work
station that keeps them from being within a foot of the screen. Frequent
breaks are also recommended.
I don't have the documents in front of me, but these are general impressions I
get after having seen numerous articles in "Information Display." Notebook and
laptop computers using LCD display devices are pretty safe from a radiation
point of view. Eye strain is a greater danger. Eye strain is probably a
greater danger when using CRT displays as well.
- Howard Solomon
technical instructor
Panasonic Services Co.
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