I thought it was just the RF field that was changing
within a steady magnetic field. Did some more reading
and found there is a smaller magnetic field that is
pulsed.
I was wondering what the RF frequency was. It doesn't
seem to be mentioned in anything I have read.
Dave
--- Ken Brown <ken.d.brown@verizon.net> wrote: >
David McClafferty wrote:
>
> >To induce a current into a conductor the magnetic
> >field must be varying or the conductor or field
> must
> >be moving. The magnetism in an MRI machine is
> steady,
> >so unless they wheeled you in there quite fast, you
> >wouldn't get much current induced into your body.
> >
> >
> Excuse me, but if there is no change in the field,
> it will not make
> anything resonate. I'll look at the url you included
> later and see what
> they say. If they say that it is a constant, non
> varying magnetic field,
> then I say they are wrong. I took my VX-5 handheld
> radio and listened
> outside the lab while my wife was in the MRI
> machine. And I heard lots
> of varying pulse rates and bandwidth signals around
> the 60 MHz area.
> What I heard defininately came from the MRI machine,
> and it is not
> surprising that water molecules have a resonance
> around 60 MHz, human
> bodys being mostly water. Also the spare 3CX800A7s
> that I have for my
> Titan 425 are pulls from a MRI machine. If it was a
> constant magnetic
> field and not a varying one (at RF frequencies where
> ther are resonances
> with things in the body) they could just use a
> switch of some sort and
> not need a power amplifier tube>
>
>
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