ERNEST ORLANDO LAWRENCE , BERKELEY NATIONAL LABORATORY = ARCHIVES AND RECORDS OFFICE PROVENANCESTAMP Accession Number: File Code Number: | - DivisiowDepartmenvGroup; CHAR Series Title: = Box Number: Folder Title: Pe ae # 402842 R Bldg. 4, Bm 203 Bret COPY AVAILABLE December 19, 1957 MDT~1167~57 Dre Ce Ie Dunham Division of Biology and Medicine Atomic Energy Comuisaion Washington 25, D.C. Dear Dr. Dunhass We confirm our phone of 0820 PST today reporting a Berkeley UCRL air sample for the 24 hour period ending 0800 December 13th exhibiting bete-gamma emitters in excess of 5 fold background, after 72 hours decay. A subsequent 3 day sample confirms, Our Livermore Lab data were similar but of less magnitude. Verbal inquiry revealed three other California points observed increases. Per your advice we shall continue to supply this sort of information upon occurrence. Very truly yours, M, D. Thaxter Health Chenistry MDT/cg Info cyt cog Wade T Biophysics Branch, DEM, ARC, Wash.DC SYOO, AEC Patterson Wilkes fee pats seu“ 41 Thy &!