We use aquarium gravel for this purpose. It does not have the fine
dust-like particles that normal construction gravel might.
On 12/4/20 11:42 AM, Nukri Sanishvili wrote:
Hi John,
I think I know what might have happened:
Many of the MX beamlines at the APS use some sort of filler in the
containers where the LN2 is dumped. If I remember correctly, one of
the beamlines is using fine gravel for this purpose. Also, it is
required that before shipping, the dewars are emptied - i.e. don't
contain liquid. Now, imagine somebody dumping the liquid into the
grave-filled container without removing the blue cap and without
holding the dewar in the air - i.e. the top of the dewar with the cap
on is slightly buried into the gravel. Upon straightening the dewar
up, the blue cap would scoop up a little bit of the gravel.
Distribution of the pebbles on your picture is also noteworthy. It
suggests the side where the pebbles are was the side dipped into the
gravel.
You might want to discuss this with your beamline host.
Best,
Nukri
On Fri, Dec 4, 2020 at 10:05 AM Tanner, John J. <tanne...@missouri.edu
<mailto:tanne...@missouri.edu>> wrote:
When we opened our CX100 shipping dewar returned from APS via
FedEx this week, we observed what appears to be tiny rocks on the
rim below the foam neck core:
https://www.dropbox.com/s/ky09a1vbm9t0mrl/CX100withrocks.png?dl=0
<https://www.dropbox.com/s/ky09a1vbm9t0mrl/CX100withrocks.png?dl=0>
Has anyone seen this before? Is this perhaps the absorbent
material from the inside of the dewar?
Thanks,
Jack
John J. Tanner
Professor of Biochemistry and Chemistry
Associate Chair of Biochemistry
Department of Biochemistry
University of Missouri
117 Schweitzer Hall
503 S College Avenue
Columbia, MO 65211
Phone: 573-884-1280
Email: tanne...@missouri.edu <mailto:tanne...@missouri.edu>
https://cafnrfaculty.missouri.edu/tannerlab/
<https://cafnrfaculty.missouri.edu/tannerlab/>
Lab: Schlundt Annex rooms 3,6,9, 203B, 203C
Office: Schlundt Annex 203A
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modern man in a post-modern world
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