Dear Nils,
sorry to hear about your health issues.
I can not comment on the safety aspects of a shunt valve in an NMR lab.
But I can tell you that for most magnets the stray field outside the
cryostat is typically in the range of miliTesla. For the shielded
magnets the 5 Gauss line (0.5 mT) is just outside the outer walls of the
cryostat. For very high field magnets or unshielded magnet this 0.5 mT
line might be up to several meters away form the magnet.
For example a shielded 800 MHz Magnet will have the 0.5 mT line at 1.25
m radially and 2.5 m vertically from the magnetic center.
The 200mT or 0.2T line is at 0.46m radially and 0.76 m vertically. This
puts it practically all inside the cryostat. The highest field can be
found at the bottom of the magnet right near the magnet bore. '
A probe change might expose you to the highest file but still well below
1T.
This all changes drastically when dealing with MRI magnets. But these
are not my forte.
With best regards
Clemens
On 8/6/2025 9:45 AM, Nils Schlörer via groups.io wrote:
>
>
> Dear spinlanders,
>
> I am in the unfortunate situation to see forward to receiving a shunt
> drainage implant for CSF liquid to manage a hydrocephalus condition.
> After so me initial research, I noticed that the shunt valves which my
> surgeon suggests to use (Miethke M-Blue) are sensitive to electromagnetic
> fields. It seems that exposition to more than 3 T field strength is not
> recommended.
>
> Therefore my question: Does anyone have experience with the use of a CSF
> shunt valve in an NMR laboratory?
> Any feedback I would be highly appreciated!
>
> Cheers,
> Nils
>
>
> Dr. Nils Schloerer
> NMR Spectroscopy Platform
> Friedrich Schiller University Jena
> Faculty of Chemistry and Earth Sciences
> Humboldtstr. 10
> 07743 Jena
> Germany
>
> Room K006A
>
> Tel.: +49 (0)3641 948253
> E-Mail: nils.schloerer_at_uni-jena.de
> http://www.nmr.uni-jena.de/en
>
>
>
--
==========================
==========================
====================
Clemens Anklin Ph.D. Vice President
Bruker BioSpin NMR Applications & Training
15 Fortune Drive NEW Phone: 978-313-5NMR(5667)
Billerica MA 01821 bluesky: _at_canklin.bsky.social
web: http://www.bruker.com
e-mail: clemens.anklin_at_bruker.com
==========================
==========================
====================
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Received on Wed Aug 06 2025 - 09:54:58 MST