Interesting observation. In our home X-ray lab, we constructed a liquid nitrogen dumping station from a large garbage can filled with sand to about 12 inches. To keep the sand out of the dewars we topped the sand with a large wad of screen-door netting. All items can easily be purchased from a local home improvement store, and the screen-door netting is super cheap (plus it makes it easy to remove the stray bits of garbage that mistakenly find their way into the nitrogen dump/garbage can (you can put a sign that states, “not for garbage” on a garbage can, but you can’t get 100% compliance, LOL).
Diana ************************************************** Diana R. Tomchick Professor Departments of Biophysics and Biochemistry UT Southwestern Medical Center 5323 Harry Hines Blvd. Rm. ND10.214A Dallas, TX 75390-8816 diana.tomch...@utsouthwestern.edu<mailto:diana.tomch...@utsouthwestern.edu> (214) 645-6383 (phone) (214) 645-6353 (fax) On Dec 4, 2020, at 10:42 AM, Nukri Sanishvili <sannu...@gmail.com<mailto:sannu...@gmail.com>> wrote: EXTERNAL MAIL 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 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/ 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 CAUTION: This email originated from outside UTSW. Please be cautious of links or attachments, and validate the sender's email address before replying. ________________________________ UT Southwestern Medical Center The future of medicine, today. ######################################################################## 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/
