We call this 'synchrotron dust', but our suspicion is the same that is is a breakdown product of the foam. It happens more often with old dewars than with newer ones. Once this happens, it is a good time to test the dewars.
Cheers, Jan On Fri, Feb 21, 2020 at 4:40 PM Diana Tomchick < diana.tomch...@utsouthwestern.edu> wrote: > I believe my technician decided that it was due to the breakdown of the > adsorbent foam in our oldish shipping dewar, as it stopped happening once > we replaced that particular dewar. > > But I would be open to other explanations. > > 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 > (214) 645-6383 (phone) > (214) 645-6353 (fax) > > On Feb 21, 2020, at 6:33 PM, Emilia C. Arturo (Emily) <ecgart...@gmail.com> > wrote: > > > EXTERNAL MAIL > > Hi All, > > We have been noticing lately that our crystal pucks return from different > beamlines coated with the same powdery material. For the record, we > typically undo our pucks, clean the assemblies and dry out the > pucks within a day of receiving the shipping dewar, but notice the same > thing regardless of how long between receiving the dewar and disassembling > the pucks. Have any of you experienced this sort of thing, or have > suggestions of what might be the cause and/or the powdery material? > > Regards, > Emily. > > -- > "Study as if you were going to live forever; live as if you were going to > die tomorrow." - Maria Mitchell > > "I'm not afraid of storms for I'm learning to sail my ship." - Louisa May > Alcott > > > ------------------------------ > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?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/webadmin?SUBED1=CCP4BB&A=1 > -- Jan Abendroth UCB BioSciences Seattle / Bainbridge Island, WA, USA home: jan.abendr...@gmail.com work: jan.abendr...@ucb.com ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1
