Subject:  (Pritchett) RE VDT radiation exposure...... (fwd)
Date:     Sat, 5 Dec 1998 115940 -0600 (CST)
From:     "Roy L. Beavers" <rbeavers@llion.org>
To:       emfguru <rbeavers@llion.org>
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---------- Forwarded message ----------
Date: Sat, 5 Dec 1998 08:40:03 -0800
From: "Robert L. Pritchett" 
To: "Roy L. Beavers" 
Subject: RE: VDT radiation exposure......

On the issue of shielding the Cathode-Ray-Tube (CRT)-based monitor;

Rube-Goldberg "fixes" aren't the answer. What John Unn is asking for is a
TEMPEST class machine.

See http://www.atsc-usa.com/products.html

       http://www.tempestusa.com/
       http://www.tempest-inc.com/suppliers.htm


for product lists.

See http://www.thecodex.com/
       http://www.uni-mainz.de/~pommeren/DSVorlesung/Material/Tempest
       http://www.eff.org/pub/Legal/tempest_legal.draft
       http://www.blackmagic.com/ses/ses.html

for fun & education.

Encasing the VDT with foil will have to be compromised by venting the air
holes so that the box doesn't overheat.

Most CRTs have had shields placed around the yokes since the early 1990's to
prevent exposure to the EMIs emanating from the back side of the tubes. Kits
probably can still be purchased if the unit is older...

John should check out the link below as a CHRISTmas gift option, since they
aren' t inexpensive;

Contrary to a post earlier, I don't believe (no scientific basis analyzed
for my opinion yet) that LCDs give off the kind of radiation experienced
from "screen burn" from CRTs.

http://www.cnet.com/Content/Gadgets/Special/FlatPanel/?dd.cn

Happy Holidays!

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Robert L. (Screen-burned) Pritchett, RCDD LAN Specialist
SCM Consultants, Inc.
http://www.scm-ae.com/itgroup/roberts.htm
robertp@scm-ae.com Pager: 509-530-8324






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Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html