John A, Derry &. September 11, 1950 Coorcaination with the Haval esearch Laboratory Durine the month, earranzenents were made lor versonnel Yrom the dew York Uperations Cffice and the Oak Ridge National Laboravory to visit the taval Research Laboratory. Personnel from UYUO visited Jr, Sidney Leibson at ‘ini to discuss halozen filled Jeiger counters. wr. Leibson had performed much of the original work on these tyve tubes. ORNL personnel visited the laboratory to discuss experiments being performed on scintillators for photomultiplier tubes, ciuch useful information was exchanged between these jroups. Snclosures: As described in IF above (in triv.) Eae CHIV DOZ AR