Re: E-M fields health risks

[William Beaty <billb@ESKIMO.COM>]

On Sat, 21 Jul 2001, Doug Craigen wrote:

> Bernard Cleyet wrote:
> > what's the skin depth for mag. fields @ 60 Hz. through saline (the mother
> > including the amniotic fluid)?
> >
> > cm or meters?
>
> Skin depth wouldn't be an applicable quantity here.

Skin depth tells you the thickness of conductor needed for shielding
constant-frequency fields, be they radiation or nearfield (such as the
alternating b-field near a power line.)

I don't remember where I found the equation last, but if I recall, skin
depth for a good conductor (copper) at 60Hz was on the order of
millimeters, so power lines a few cm in diamter will have far less current
in the center.  FOr a weak concentration salt water, it would be much
deeper, so I would speculate that the outside of your body does not
significantly shield the inside.



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