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> 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 > > 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 <tanne...@missouri.edu> > https://cafnrfaculty.missouri.edu/tannerlab/ > Lab: Schlundt Annex rooms 3,6,9, 203B, 203C > Office: Schlundt Annex 203A > > ------------------------------ > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 > ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
