[Hallb-engineering] Fwd: Clearance of Cold Cathode Gauges
tilles at jlab.org
Fri Feb 23 06:33:23 EST 2018
----- Forwarded Message -----
From: "Keith Welch" <welch at jlab.org>
To: "Anthony DiPette" <dipette at jlab.org>, "Jessie Butler" <jbutler at jlab.org>, "Tom Carstens" <carstens at jlab.org>, "Doug Tilles" <tilles at jlab.org>, "Walter Kellner" <kellner at jlab.org>, "Dave Meekins" <meekins at jlab.org>
Cc: "Adam Hartberger" <adamh at jlab.org>, "David Hamlette" <hamlette at jlab.org>, kennell at jlab.org
Sent: Thursday, February 22, 2018 5:02:32 PM
Subject: Clearance of Cold Cathode Gauges
As some of you know from recent discussions with our team, we are
currently investigating an issue with our ability to detect activation
in cold cathode vacuum sensors. The powerful permanent magnets in these
devices produce a field that interferes with detection in the meters we
use for our approved protocols for clearance of materials. We can
achieve good detection with other instruments, but those meters are not
currently approved for the release of materials.
We are currently working with your groups to spot check and screen
sensors that are in storage to verify they are not activated. But since
we technically do not have an approved process for unrestricted release
for the magnets, these devices /*must not be shipped offsite or disposed
of as waste or scrap*/, even if they've been surveyed.
If the gauges are disassembled, we can release the non-magnetic
components. But any fully assembled gauge, or the separated magnets are
to be considered "conditionally released" and must remain onsite. As we
spot check these devices, we will label them to remind the users of
their conditional release status.
If you wish to dispose of any gauges, please notify us and we will
arrange to have them disposed as radioactive waste.
This is a precautionary measure, as our investigation has indicated that
it is unlikely for any significant activation levels to have evaded us.
Because of the number of these gauges that are in use or storage around
the site, we're asking for your assistance in ensuring that they are
controlled as described above. Please help us communicate this
information to all your staff that may work with these devices.
If you have any questions about this, please don't hesitate to contact
me or David Hamlette.
12,000 Jefferson Ave.
Newport News, VA 23606
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