1.1 OBJECTIVES The objectives of Project &.1 were: 1) te determine ganme exposures versus distance from the point of detonation of various high- yield therscouclear devices; end #) to Arey conclusions fron the data__ concerning gamma exposure contours for various types of detanations, and the validity of scaling laws. A secondary objective was to determine the gamma exposures received in several discrete time intervals detwean time of arrival. of the thermal pulse and one minute after time of detonation. 1.2 BACKGROUND Initial game radiation may be considered es that enitted during the first } seconds after detonation. The initial gaum refiation out for nuclear devices with yielés up to 250-kt has been well docusented in previous test operations (References 2, 3, and &). Gemme-rediation measurements from high-yield nuclear devices Gazing Operation Try showed. that the initial geame refiiation @14 not fellow the same scaling law that had been established for amllier devices (Reference $). This was a aa Lt ATOING ERD OY ACT OFS 3