Subject: (Curry) Microwave Shields (fwd)
Date: Tue, 22 Dec 1998 194136 -0600 (CST)
From: "Roy L. Beavers" <rbeavers@llion.org>
To: emfguru <rbeavers@llion.org>
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---------- Forwarded message ----------
Date: Tue, 22 Dec 1998 17:19:43 -0700
From: "Bill P. Curry"
To: "Roy L. Beavers"
Subject: Microwave Shields
Roy,
If I am stepping on anyone's toes on this list, I apologize, but I am
concerned that there appears to be charlantry in the some of the shielding
technology that I have seen advertised on the Internnet. In particular, I
think some concepts invoke powers of crystals in an almost mystical way. One
device, whose home page I examined, claimed to use Bragg scattering and von
Laue scattering to explain how it could protect against EMR. I have to say
that this is a ridiculous claim! Both these types of scattering occur in
crystals with incident radiation of x-ray wavelengths. Note that x-ray
wavelengths are 100 million to 1 Billion times smaller than microwave
wavelengths. Accordingly, if Bragg diffraction (which is a coherent form of
scattering) were to occur at microwave wavelengths, the spacing between
crystal planes that cause the diffraction would have to be 100 million times
larger than it is in nature! I am afraid that shields based on this concept
have no validity from the standpoint of the laws of physics!
--
----
Bill P. Curry, Ph.D. |Physics is fun.
EMSciTek Consulting Co. |Trying to make a living!
22W101 McCarron Road, |Phone: (630) 858-9377
Glen Ellyn, IL 60137 |Fax: same, but require prior notice
Home page: http://www.EMSciTek.com
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Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html