Valerie Robertson, AMMRL:
The siting of NMR Magnets is not a trivial matter. People have died because
of "pencil whipping" the site certification. I give you this opinion with
the additional caveat that almost all NMR sites have been "pencil whipped"
to some extent or another.
You may or may not have the abilities and expertise to do the proper site
certification. There are at several major areas of engineering expertise
that you require:
==:>Magnetic field safety (This is a known killer:(Last year 6Yr. old child)
==:>RF field safety (This is a known pro-creation ender:(
==:>Magnetic and RF field interference (outside experiment killer ... career
ender:(
==:>HVAC capacity and air handling ability during the eventual quenches and
high volume transfers that can cause deadly low Oxygen environments. (This
a known killer:(NYC circa ~2000 24Yr old magnet engineer ... Talk to MAGNEX
USA)
NASA has lost several who ended their lives when they entered a compartment
with low or no Oxygen. NASA sent the victums they produced from only one of
these accidents to UF because of our NASA hyperbaric chamber.
GO WITH NEWER SHIELDED MAGNETS IF YOU CAN AFFORD THEM ... they are much
safer to untrained personnel (usually everyone but you and your staff).
Newer magnets are also much better than some of the older monsters. We have
a very wide bore horizontal MAGNEX ICR magnet that has a 5 gauss field
inside of the magnet body! We also have a OLD 300 Mhz Oxford that has a 100
gauss field that is similar to the Magnex 300Mhz 5 gauss! This is a scary
room for moving cylinders!
The good news is that you can become expert in these matters as long as you
are willing to seek out the help and are willing to pay for some of it ...
you will also recieve the benifit of these interactions. Seek help where
you can find it ... many times it is free:) Please do not ignore good
advise because of its $ cost because it may have a high price in human terms
later.
Robert Harker
///(--(-)--)\\\
Engineer
University of Florida
Dept. Chemistry, NMR LABS, MS 82
Gainesville, Florida 32611-7200
PS: I was Born in Southamton Ont. overlooking the Saugeen Chipewa Indian
Reservation were I had the pleasure of spending many youthful summers. Once
Canadian ... always Canadian ... Go CANADA! I'm also a ~13 yr US navy
Veteran serving is many interesting hi-tech capacities ... So I can wave
both flags proudly. GO - USA !
-----Original Message-----
> From: Valerie Robertson [mailto:vroberts_at_uoguelph.ca]
> Sent: Monday, February 25, 2002 3:02 PM
> To: ammrl_at_chemnmr.colorado.edu
> Subject: magnets and mass specs
BlankDear Colleagues,
We are in the planning stages of a new chemistry building, which will
include large NMR and Mass Spec facilities. The Mass Spec people are quite
concerned about the impact of our magnets on their equipment. We're planning
on some big magnets, but they will be shielded. Could anyone out there with
some actual experience let me know if they've experienced any problems - how
close things could get and still work etc.
Any help much appreciated -
Cheers
Valerie
**********************
Valerie Robertson
NMR Facility Manager
Department of Chemistry/ F&SM NMR Centre
University of Guelph
phone: (519)824-4120 x8914
fax:(519)766-1499
Received on Wed Feb 27 2002 - 10:51:00 MST