area near the old village site was chosen for a more detailed clearing experiment. The choice of locations and number cf survey transects was limited by the location of good boat landing areas, the available time, and the small size of the survey party. The map of Bikini Island (Figure 3) shows the approximate routes of the survey and the spectrometer and ion chamber measurement locations. A number of spectrometer measurements were made in the vicinity of Tent 1 at the beginning of the 0 Transect (near the lagoon shore) while work progressed on clearing the transect. The transect was then surveyed with the portable meters, and spectrometer measurements made at some of the areas exhibiting significantly higher or lcwer radiation ievels. The Village Road required a minimum of clearing to be made passable. The 1 Transect again required considerable work with machetes and chain saws to allow passage for a portable meter survey. Field spectrometric measurements were also made at the midpoint of the Village Road and at the area chosen for the clearing experiment. For the North and South End Transects, no clearing was necessary. Total and Individual Isotope Exposure Rates Along the O Transect - Readings of the portable scintillation counter were made every 50 ft. along the 2850 ft. O Transect. Geiger counter readings were recorded every 150 ft. These readings along with the ionization chamber results provide a profile of the radiation levels across the island as shown in Figure 4. Most of these data fall within a band of exposure rates ranging from 20 to 30 ur/hr near the lagoon shore, from 50 to 80 ur/hr in the center of the island, and from 10 to 20 ur/hr near the ocean beach. Several areas exhibited much higher exposure rates than these average values. There were also some locations which exhibited significantly lower than average radiation levels. The increase in radiation near the center of the island appeared to correlate with the density of the vegetation. Near the shores the vegetation is sparse and the soil is very