Each sample was then gamma-scanned in the field counting lab, and then placed into storage until it could be shipped to the laboratory on-continent. All shipments of soil samples were made according to current USAF, DOT and DOA regulations. Samples were transported by air from Eniwetok Atoll to Honolulu, Hawaii, to Livermore, California. Appropriate Department of Agriculture exemptions were obtained to allow for samples to pass unopened turough U. S. Ports of Entry. On-Site Counting Facility. lished on FRED. A radiation counting laboratory was estab- This laboratory had a 3" x 3" NaI detector and an intrinsic Ge detector together with associated electronics. This capability allowed scanning of soil samples for gamma-emitting fission and neutron activation productions, as well as for Americium-241, associated with Plutonium-239. The data obtained by this scanning process provided information which influenced the soils program. Additional soils samples were obtained from hot spots found only by the scanning process. The information was also valuable in determining future analysis performed on the samples when they arrived on-continent. This preliminary activity estimate of samples with obvious large concentrations of radionuclides also assisted in assigning appropriate shipment classifications, according to DOT regulations. Terrestrial Radiation Measurements Radiation exposure rate measurements were obtained on the surface of every island in Eniwetok Atoll. There were two basic methods utilized, portable survey instrumentation and objectively placed TLD's. The purpose of the terrestrial radiation measurement program was multifold: Produce a detailed examination of the geographical variability of the gamma exposure rate of air on each island due to the gamma rays of greater than 100 KeV emitted by radionuclides deposited in the soil. omy iy 1.