wan -- 4 Project 2.63 - Collection and Characterization of Fallout with Time T. Triffet OBJECTIVES To collect samples of fallout and measure radiation field intensities with time at various distances from high yield land, water and air thermonuclear detonations, To study these samples from early times with respect to gamma and beta activity, to analyze them for chemical and radiochemical composition and to determine certain of their physical properties, including distributions of particle sizes, DESCRIPTION AND EXPERIMENTAL PROCEDURES q Two YFNB barges and three pontoon rafts were anchored in Bikini Lagoon. YFNB29 carried two Standard Platforms with Major Arrays of instruments and YFNB13 carried one, Each Major Array consisted of four Open-Close Total Collectors, two Always-Open Total Collectors, one Incremental Collector, one Gamma Intensity vs Time Recorder, and one Wind Speed and Direction Recorder. automatic. The arrays on the barges were fully Each pontoon raft carried an Always-Open Total Collector, a Time of Arrival Detector and a film pack to measure total dose, An array of 16 skiffs was deep-sea anchored by Project 2.62 between 10 and 30 miles from ground zero in the expected fallout area. Each carried a minor array. YAG 40, YAG 39, and LST 611 were located at 65, 135, and 190 miles from ground zero, respectively. Each was extensively instrumented with a major array supplemented by incremental collectors and high volume filter units. 4,\ 2. ) 2-33 - + ro t say CL ety ~« e ct free d