Order number eee ete100 of Lo PFELCIAL USE ONLY page 57 801. KEYWORD (S) ’ presents particle size versus time of arrival after detonation as well as measurements of particle density and relative specific activity. Estimates éf mass and relative activity of fallout per unit area for certain locations about the shot point are shown. FALLOUT/chemical composition ;FALLOUT/physical properties ;REDWING/fallout ;SURFACE BURSTS/fallout ; FALLOUT; PARTICLES ; REDWING; AUTORADIOGRAPHY; PARTICLE SIZE; TIME OF ARRIVAL; CHLORIDES; WATER; SLURRIES Item 98 150. REPORT NUMBER 70. 710. PERSONAL AUTHOR (M) CORPORATE SOURCE (USA) La Riviere, P.D. Naval Radiological Defense Lab., CLASSIF. Unclassified 110. PRIMARY TITLE (M) NRDL-TR--137 Relationship of time of peak activity from fall-out to time of arrival 371. PUB. DATE (YYMMDD) 34. 950. ABSTRACT LEVEL TEXT San Francisco, CA 570228 The time of arrival (t{sub p}), (t{sub a}), and time of cessation time of peak (t{sub c}) of fall-out are shown by related equations where the times are hours after detonation. These relations are shown to apply over a wide range of arrival times, yields, and scaled 801. KEYWORD (S) depths. FALLOUT/time of arrival ;FALLOUT/decay ; CASTLE/fallout ;GREENHOUSE/fallout ;REDWING/fallout ; TEAPOT/fallout ; WIGWAM/fallout ;FALLOUT; DECAY; ATOMIC EXPLOSIONS; CASTLE;DOSE RATES;GAMMA RADIATION; GREENHOUSE; REDWING; TEAPOT Item 99 150. 110. REPORT NUMBER PRIMARY TITLE (M) NRDL-TR--166 Salt concentration in the air at Bikini Atoll: preliminary study 70. PERSONAL AUTHOR(M) Evans, E.C. III 710. CORPORATE SOURCE Naval Radiological Defense Lab., 371. PUB. 570515 (USA) DATE (YYMMDD) San Francisco, a CA 34. CLASSIF. LEVEL TEXT Unclassified 950. ABSTRACT This preliminary study conducted at the Bikini Atoll investigated the variation of salt cdOhcentration in the first 300 ft of atmosphere by collection on specially developed silver dichromate reagent films. For a 10-knot wind maximum concentration appeared to exist at 50 to 75 ft above Mean Low Water Springs, with the possibility of a second maximum somewhere above 300 ft. Preliminary size-frequency counts showed a bimodal 5003431 OFFICIAL USE ONLY