UNCLASSIFIED Sopreeree RM=1260—=AEC -29- (apm/gal ) a. 5 gal . C.30 r 0.03 b. 5 gal. 0.23 + 0.03 Filter paper from the Naval Research Laboratary’'s routine air filtration program. Army Chemical 6 (d4pm,'10° cu. ft. of air) Corps Type 5 paper, 99% efficient down to perticles of a fuw tenths microns diameter, 75% efficient for particles .0: to i. 001 aterons in 41ameter Bo. 1: from Washington, D.C.; Oet. 12 <o 15, 1953; 70 hours collection; tota. air fl.w esti- 7Jo.& + 12 mated ag 2.4 x 10° eu. ft. 8.53 + No. 2: from Kodiak, Alaska: Nov. .“ to 23, 196°, 120 how's collection. total air flow es: imeated as lt x 10 eu. fr 1.4 These date are complete t:: date w F Lidty University of Chicago }0453t3 “SECRET EC ASSIFIED LANL