| a ve . | Leen ee Les (_)... ---eee 7 ew tote fee pwrae .* * re noe a = aoecath:olla . rs RM ow - . a to 2M eege OE ae seer ae Ae a Rt annealeS MB tena, oneotae tmp . me ~ . ae oa - per. - a . te tgcashes ag mn a ~ on the southeastern rim of the atoll was the most favorably F i. situated to avoid local fallout and exhibited some of the «w ; .. lowest exposure rates measured (3-7 ux/nr). wet Seve “4 ” ae ew In addition to this general pattern or radiation levels... aie . around the atoll, = ‘> . considerable variation was found on ie individual islands. 7 typically, t - he exposure rates on a given island ranged from very low near the lagoon and ocean ~~. shores to much higher near the center of the islané. This aa ee ; i effect can be related to the density of vegetation and thickness of organic soil layer. Near the shores the vege- tation was sparse and the soil very sandy, conducive to weathering and deeper penetration of fallout. Vegetation was much more dense over the central parts of the islands, where increased amounts of organic matter in the soil ‘influenced the retention of fallout near_ the surface of the more a ground. in aa ne wae we rh ge nee SATE ED ~ ote Figure 2 shows a. typical radiation profile for a survey; - ARE - s we + “bos transect across the middle“of. Bikini Island from the lagoon » shore totheocean Peach. “Readings ofthe portable/ “scintin1ation counter were made every50£t. “along this ome A CHESae, 4 - SQQ5S 143 cee « wa tires vee -A eSShe: “Sarrsaos ~ ge ale me eae ee ee ee ar eee = . ee: