sandy, conducive to weathering and deeper penetration of fallout. Vegetation is much more dense over the central part of the island. The soil contains much organic matter, and moisture is continually being drawn into the roots of the plants. These factors probably influence the retention of fallout near the surface of the ground as well as cause large local variations in soil activity. Slight depressiors in the ground surface can also become areas where fallout Might accumulate. The spectrometer and ionization chamber (As) results for locations along the O Transect are given below. The percentage of the total exposure is given in parenthesis for each emitter. SPECTROMETER AND IONIZATION CHAMBER EXPOSURE RATES _(ur/hr) Location #1 Q' #2 50! #3 50' brush) 300° 400' 1800! 1410! 19.0 (77%) 17.8 (78%) 18.9 (78%) 22.8 27.2 83.6 28.1 (61%) (62%) (74%) (76%) — & Fao 3.0 (12%) 2.4 (10%) 2.1 (9%) 11.3 12.5 19.5 4.9 (30%) (29%) (17%) (13%) *#E sb Total As 2.8 2.7 3.3 (11%) (12%) (14%) 24.8 22.9 24.3 24.0 22.8 25.0 3.5 4.0 10.3 3.8 (9%) (9%) (9%) (10%) 37.6 43.7 113.4 36.8 41.2 47.5 103.2 36.1 ~ #5 #6 #7 #8 (in *87 ag Locations 1 and 2 were close tc the lagoon shore at the beginning of the transect (0 ft. and 50 ft., respectively). These were in small clearings. The brush became quite dense only beyond about 200 ft. on the transect. The exposure rates at Locations 1 and 2 were very low, characteristic of locations near the shore. Location 3 was alsc near the 50 ft. point but with the instruments placed well in among some vegetation. A slightly higher exposure rate than at Locations 1 and 2 was recorded here. Locations 5 and 6 were 300 ft. and 400 ft. along the transect. Locaticn 7 was a slightly depressed area near the 1800 ft. point. This location was characterized by quite heavy vegetation, scaevola and a stand