Hello! There!
For a 500 MHz unshielded magnet the 5 gauss magnetic field
boundary is about 4 meter above the magnetic field centre, where the probe
coil sits. So from floor the distance would be1 meter + 4 meter = 5 meter.
Laterally(Horizontally), the 5 gauss magnetic field line would be about 3
meter from centre of magnet.
But for shielded magnet the 5 gauss line would be at a height of 2.75
meter from floor at the magnet centre. Horizontally 5 gauss line would be
about 1.2 meter from centre of the magnet.
There is alway a danger of quench with unshielded magnet
if some magnetic material is shifted exactly above magnet if height of the
room is less and 5 gauss line goes on first floor. Hence good height would
be 5 meter or 15 feet.
For further details visit
http://www.magnex.com
Best luck.
L.S.Mombasawala
NMR Lab, RSIC,
Indian Institute of Technology,
Powai, Mumbai 400 076
Phone: 0091-22-2576 7691/2/3
Fax: 0091-22-2572 3314
____________________________________________________________________
On Mon, 24 Feb 2003, Alan Brown wrote:
> Hello --
>
> We're about to build a new physical-sciences building with space for an NMR
> lab, and are thinking about the spacing between floors. Say on the ground
> floor there's a 500-MHz NMR. How far above the ground floor should the
> second floor be? We have manufacturers' specs about the distance needed for
> magnet installation, fills, & so forth; but info seems to be scarce about
> the *vertical* extent of the magnetic field. To be conservative, assume the
> magnet is unshielded.
>
> -- thanks --
>
> -- AL B.
>
>
> A.B. Brown
> Chemistry Department
> Florida Tech
> Melbourne, FL 32901
> PH(321)674-7433
> FAX(321)674-8951
> abrown_at_fit.edu
>
>
Received on Tue Feb 25 2003 - 09:54:54 MST