The condition your wife is subject to, IMO, is _very_ unusual and

deserves better study...
I'm increasing the "off-topicness" of this thread, but Daniel is right.
If your wife is more sensitive to higher frequencies, it should be more

easier to isolate her from electromagnetic fields. Lower frequency

radiation, like the 50 or 60hz coming from our electrical power networks

is more capable of penetrating metallic (or other conductive material) sheets.
So, it's probably more likely that she's sensitive to other classes of

electrical

devices, which should be given more attention... One thing that can

be an issue is tje fact of digital circuits running at higher speed

(gigahertz range)

tends to consume more electrical power, raising the amperage running

in your electrical wires, and, subsequently, the 50 or 60hz electrical field

in close range.
The digital watch clock is puzzling: surely the quartz cristal inside

nearly every

digital clock isn't in the gigaherts range AND they consume very low power...

The proximity to her body can be a factor...
On 1/30/08, Daniel A. Ramaley  wrote:

quoted text
> On Wednesday 30 January 2008 12:35, Douglas A. Tutty wrote:

> >My wife is sensitive to what she describes as electromagnetic fields.

> >She gets headaches and other pains when exposed to equipment: the

> > higher the frequency, the worse her symptoms.

>

> Rather than trying to find obsolete equipment that runs at a low

> frequency, would it be possible to build a Faraday cage around your

> computer?

>

> Has your wife had her sensitivity examined by medical professionals? Is

> it a physical problem or a psychosomatic condition? How does she react

> to fluorescent lights? Incandescents? How about driving near a radio

> transmission tower? Or for that matter, even being in a modern car? If

> there is an electronic device turned on in the next room but she is not

> aware of it, does she still experience pain? I don't need answers to

> these questions, but if there is a medical solution to your wife's

> sensitivity that might be easier than trying to banish all electronics.

>

> ------------------------------------------------------------------------

> Dan Ramaley                            Dial Center 118, Drake University

> Network Programmer/Analyst             2407 Carpenter Ave

> +1 515 271-4540                        Des Moines IA 50311 USA