Re: spectroscopist/magnet height incompatibility

Peter Lundberg (peterl@Chem.UmU.SE)
Fri, 15 Mar 1996 09:08:50 +0100

> Has anyone noticed that their high field magnet is getting a 5 o'clock
> shadow? I recently noticed a stubble growing on the surface of the dewar
> (500 mhz) and at the top and bottom plate. Some of the particles were
> "big". If you have this problem you can remove most of the particles with
> a clothes type lint roller. Wide sticky tape also works good. I inspected
> some of the junk with a microscope and I could tell where some of them
> originated. One looked a little curly and like metal lathe turnings. We
> do have a machine shop several floors up. I am considering installing a
> sticky mat at the entrance...I wonder if anyone has done that. Magnets
> will be magnets.

We have an aluminium stepladder here - works fine. Also we change shoes at the
door to the NMR lab in an attempt to decrease the amount of "dirt and outside
dust" around the magnet.

73, Peter

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