CHAPTIR 6 PRIMARY FALLOUT PATTERNS ‘ ma Although there was some stem fallout vest of tae snot roint as indicated by the trajectory analysis precented in Section 5.5, the free-floating sea stations fe Shot 1 were luid just beyond tne westward limit of the gamma field. Concesuently tae buoys showed that inappreciable amounts of meterial from Snot 1 fell in the srea sanvled. For Shot 2, free-floatinz stations docunented fallout to a distarce of 50 nautical ~iles. A complete analysis of the fallout patterns to a distance of 300 nautical miles is presented for Snot 1. Because of the linited experi- mental data available for tiis snot it was not possille to reconstruct tae contours on tais basis alone. ‘the samma field data were surple- mented by developing an exnerimental model of tne fallout mechanism wWhicn defined the axis of symmetry of the pattern. abled one to construct a conplete contour pattern, This addition en- Fallout patterns for Snots 5 and 6 were derived from water sam- pling data and are considered in Project 2.7.4/ 6.1 FALLOUT NEAR GROU!D ZERO FOR SHOTS 1.3.4.AND 6 To obtain the infinite field ga-ma levels witain the atolls, taree basic collecting devices were fpleced on the islands and on the rafts within tne lagoon as follows: (a) Totel collector - a 7-in. diameter polyethylene funnel (b) Gummed paper collector - 1 sq ft of Xum—Kleen ecetate-backed fitted to a legal polyethylene bottle. paper stapled to a cardboard backing supported in a metal tray. (ec) Project 2.1 film badges placed toth vertically and horizon- tally. By comparing the laboratory mes:ured levels of gamma activity ob~ tained from sanples that were collected on islands with the actual in-~ finite field gamma survey readings, a relctionship was developed and Th ou NMe taken for Shot 5. . Data were obtained under tne land and lagoon phase for Snots 1,3,4, and 6. The legoon and islends were not contaminated after Shot 2 and no data were WwW ‘ The extent of fallout documentation ucder the two operctional Phases of Project 2.5a was different for the various saots.