a 2-11 g and spectrum as a function of distince NIE30. To achieve this objective, the project participated during shots Yellowwood and Valnut, The measurements were extended turin: the field nhase of the opera- tion to include shot Tuince, and tris perticipetion is covered in the portion of this report relating to th:t detonation. To make the necessary measure- ments, threshold-activation and fission detectors were exposed as a function of distance from the Yfellowwood end Valnut vero points. These detectors in- cluded gold, cadmiumeplated gold, pluteniunm, -: xtunium, uranium, sulfur, end girconium. Since land masses of sufficient siz: were not available for dis- playing the detectors with distance, a buoy line was used. from 917 to 4,100 yards from ground zero Zor beth sncts. The line extendec Due to the radio-w logical situetion that existed after these ictonations, recovery could net be effected witil D+l day. data was obtained. xs a resul+, only limited neutron flux and dose “arly results indic te the: the neutron dose for shot Yellowwood was lower than prediction (by MT -23+200) by a factor of 2.3 and the “.alnut doses were low by 2 factor of 2.06. Fallout Sempling. This was a determirs-icr af the relative contribution of certain isotores to both locel and world-wide fallout and the use of this information, if possible, to det-rmine wne fraction of total bomb debris deposited in the local area, Th: groieet ves divided into two separate efforts. 1. The collection of early clou: samples by means of newly developed rocket samplers. 2. The collection of residual cloud samples anc fallout debris by air- craft. The rocket sampling was to have teen accomplished with rockets being developed by UCKL Project 21,3. Gas and particulate sampling of the residual cloud nas accomplished by Be57° aircraft i.ncer the technical supervision of LASL personnel. fa) COPEns + Leiet ag Fallovt samples were col.ected at various times after the war 2 pcs ZS