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post #101 of 103
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Originally Posted by Danja View Post

I'm not sure that the NMR should have affected her if it was in another room. NMRs are shielded pretty well; as I'm sure you know, most have a chained-off 5 Gauss line that's pretty close to the spec. That means the field fell off from 7.4 Tesla to .0005 Tesla in about 10 feet, or whatever the distance from the spec is. If you simplify the NMR field to follow the inverse square law, then you basically get no field at 20 feet from the spec. A quick search online says that phones have a field of 20 milligauss 4 inches from the antenna, so that's really small as well and I have trouble believing people can feel that. But assuming she could, I'm not sure she would have picked up on the NMR.
That said, with her mindset she probably should have stayed away from it biggrin.gif

Don't confuse the static magnetic field from the applied RF during measurements. NMR instruments are not typically shielded against RF. They may have magnetic shielding around the static magnetic field, but RF pours out of them like crazy. The frequently high-powered applied RF pulses from the sample probe during measurements contributes to most, if not all, of the detectable RF--often times the applied RF is anywhere from 100w to 1kw (or more, depending on the hardware). thumb.gif
    
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post #102 of 103
radiation = cancer. nuff said
post #103 of 103
Quote:
Originally Posted by guyladouche View Post

Don't confuse the static magnetic field from the applied RF during measurements. NMR instruments are not typically shielded against RF. They may have magnetic shielding around the static magnetic field, but RF pours out of them like crazy. The frequently high-powered applied RF pulses from the sample probe during measurements contributes to most, if not all, of the detectable RF--often times the applied RF is anywhere from 100w to 1kw (or more, depending on the hardware). thumb.gif

D'oh! I should have thought before posting, considering I work on the stupid machine (undergrad). Rep'd for showing me what's up.
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