ur/hr. This would result in a fairly sizable increase in skin dose but a fairly negligible increase in dose to the reproduction organs because of the low penetrating ability of °°sr Be-rays. We estimate that the maximum bone .marrow and gonadal doses to a person sitting on the surface of the ground would be at most 10% of the corresponding *87 a5 y-ray dose, while at 1 meter above the ground this ratio would probably be even less than 0.05. Since ®°°Sr can be taken up by plants and enter the food chain, the high levels of °°Sr in the soils of Bikini Atoll should be considered more an internal radiation hazard rather than an external radiation hazard and, this report. therefore, will not be considered further in In this section, the external radiation environment on each of the islands surveyed is discussed in detail beginning with the largest island, Bikini. All of the terrestrial gamma total exposure rate data discussed in this section are given in Table 1. The available soil concentration data at the time of publication are given in Table 2. Examples of the Ge(Li} spectra of several of the soil samples from various islands are shown in Figures 8 through 12. A. Bikini Island Bikini Island, the largest island of the atoll, is approximately 1/2 mile wide and 2 1/2 miles long (see Figure 3). The island is quite heavily overgrown with brush, primarily scaevola, making passage across the island very difficult. Coconut paims and pandanas trees are Significantly few in number. Most of these disappeared during the testing period as roads were laid across the island and land was cleared for housing and work areas. The radiation survey of Bikini concentrated on the former native village area on the lagoon side near the center of the island. Two paths were cut across the island near the northern and southern ends of the village area. A survey between these paths was conducted along the overgrown village road which runs along the lagoon shore about 100 ft. inland. Measurements were also made on paths cut across the northern and southern tips of the island. A heavily vegetated