Re[2]: DeGaussing an MRI suite

["Jim Dunlap" <jim.dunlap@guardian.brooks.af.mil>]

     EXCELLENT ANSWER!  THANKS MUCH.


______________________________ Reply Separator _________________________________
Subject: Re: DeGaussing an MRI suite
Author:  radsafe@romulus.ehs.uiuc.edu at guardian
Date:    1/28/99 12:57 PM


Not really, Jim.  That would be induced magnetism, more that a static magnetic
field.  In this case, as in at our lab, it is the magnetic field left in an
electromagnet after the current to the electromagnet is removed.  As
differentiated from a dynamic magnetic field, controlled by the current.  A good
analogy would be an accelerators prompt radiation vs. induced radiation.

Scott

Jim Dunlap wrote:

> So, 'Static Magnetic" is the residual magnetism is ferromagnetic materials
> exposed to magnetic fields, such as those generated from an MRI machine.  I
may
> have known that at one time, but had forgotten.  I have some hammers and and
> screwdrivers that were magnetised.  They 'grab' and tend to 'hold on to' some
> screws and nails.  Thanks.

--
Scott O. Schwahn, CHP
Thomas Jefferson National Accelerator Facility
schwahn@jlab.org


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