Again the TLD results (Table 1) show the same pattern as the survey meter results with the 4 HASL TLD results agreeing very well with the corresponding HASL scintillation counter readings. Total Exposure Rates Along the South and North End Transects ~ Short transects were made of the north and south tips of the island. The vegetation was not thick in these areas. Along the North End Transect and around an 85 ft. tower, observation the exposure rates were typical of close-to-shore values; 20 to 40 ur/hr. The South End Transect was through a former construction camp housing area. Exposure rates were low in the open areas; 5 to 25 ur/hr. In a small cordia grove on the lagoon side of the island a value of 60 ur/hr was obtained. Other high readings, 50 to 60 ur/hr, were noted when the survey meter was placed near the concrete housing foundations in the area. This activity can possibly be explained as due to retenticn of fallout which accumulated on the rough concrete surfaces. No soil sample or field spectrometric data were obtained although a few TLD units were exposed (see Table 1}. Total and Individual Isotope Exposure Rates at the Clearing Experiment Site - The question whether uptake of radioactive materials by plants contributes significantly to the external radiation field was carefully investigated. If such uptake were significant, clearing the brush might reduce the radiation levels to some extent. The area chosen for the experiment was of quite dense vegetation, mainly scaevola 8 ft. to 10 ft. high, about 400 ft. inland from the 1800 ft. station on the Village Road. Initial survey meter readings about the center of the area indicated fairly uniform exposure rates of about 60 ur/hr. A full set of spectrometer and ionization chamber measurements were made before any clearing began and were repeated as the area was progres~ Sively cleared to a 10 ft., 20 ft., and 30 ft. radius. These measurements showed no significant effect on exposure rate or changes in the spectrum. below. - 24 - These results are summarized