Files Se -3- February 3, 1955 AFCRO - Ceophysics esearch Directorates Friday was spent at Bedford with Br. Martell and his group (Junce, Kilkstein andPrevinsky). The laboratory is gradually taking shape. Results on Ba!40/gr% in rain parallel Eurodas’ and sre very iupressive. The use of salt concentrations for normelixing specific activity to air volume scawenzed is being explored. Yb710 may possibly be used similarly. Tritius eaelysis is expected to get underway on stratospheric samples next summer. Martell hopes to contract with Suase or Yon Buttlar for low-level triciun. wh102 hag been detected in three stratoepheric aalysis samples covering a wide range of latitedes.. Gendenestion suclet counting and impectors are being used to study natural dust in the troposphere end atratesphere. This eppears to be a wide open and important field for study. Martell and Amge ere now badly in need of wore contract and equipment funds in order te sampling get the samples needed to follow up the indications from the very onsll sumber of seasurenents aesde op fer. Some of the implications regeuding the fate of bomb debris, troposphere-stratosphere exchange, chemical reactions in the stratosphere, metecritic accretion, the origin of natural freezing ouclei and other important questions are surprising but, eo far, highly speculative. cc: Dr. Shilling Mer. Whitnah OFFICE » SURNAME > DATE > a Helland:pas Form AEC-318 (Rev. 9-3) 2/3/59 ; * & covmnuauny pmiaine cerice ewe | . Dom ARCHIVES .