Non Ionizing Rad Question

[Russ Johnson <rujohnso@nmsu.edu>]

New question for the community, but a little outside the lines of

ionizing rad. We recently had some researchers install an NMR in our

chemistry dept. Protocols I've seen all say to establish a line of

demarcation at 5 gauss, whereby only those operating or maintaining the

equipment are allowed entry. However, someone supposedly took a meter

into an adjacent lavoratory and read 30 gauss there when it was

operating (staff apparently not from our dept). I don't know what it is

in the lab when running, but it would certainly have to be much higher.



So, the questions are related to how to safely control that area when

equipment is running. Putting notice signs on the lab doors to restrict

access just doesn't cut it. Is there any kind of "affordable"

cost-effective shielding that could be installed to break-up or

significantly lower the magnetic field outside the lab? Any source for

it? Related question, what is the standard being referred to for the 5

gauss control point? Reply on or offline Thanks.

-Russ Johnson

 Rad Safety Specialist



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