Spacing from NMR

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	Question by Philip Carter posted 01 Aug 2002
	Spacing from NMR
What is the recommended spacing for network and phone cable from a NMR spectrometer that produces a 270 MHz, 5 gauss field at 2 meters ?
	Answer by Dmitri Abaimov posted 01 Aug 2002
Dear Philip, Have you considered fiber already? If my calculations are correct, here is what we have: electrical performance is guaranteed for a CAT5E cable for up to 3V/m electrical field strength. Magnetic field strength does not matter in a sense, but we should consider that at very high frequencies (like 270MHz) there is a conversion ratio between electrical and magnetic field energy. It's approximatelly 30V/m per 1 milligauss. For 5 gauss magnetic field strength the theoretical calculated electical field strength will be ~ 150,000V/m which means that you may be disturbing networks in the entire town ;-). Then, of course the building architecture details will matter. What is it that the walls are made from? And so on. But the bottom line is: stay as far as you possibly can (and it still may not be far enough). Or consider using fiber optics in this room. Sincerely, Dmitri Abaimov, RCDD
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