a large abundance of !37Cs relative to other ganma emitting nuclides no effort was made to correct the readings obtained from the scintillators which were calibrated against !37Cs. The islands can be divided into essentially three domains: 1. Beach Area - uniformly Tow background of approximately 10 uR/hr. 2. Village Area - located along lagoon side of the island. For purposes of this report two sets of data were obtained: a. From lagoon road to approximately 250 feet inland the mean background was 52 uR/hr. b. From lagoon road to beach - 35 uR/hr. Considering these two areas together the mean background would be 44 .R/hr. 3. Interjor - used for agriculture. This was considered to include ‘the area within the perimeter road, excluding the village area. The mean background was 86 ,,R/hr. Experience obtained during the clearing operation indicates that total] renoval of the vegetative cover and turning of the soil as occurred during the grading of the perimeter and cross island roads results in a rapid reduction of the measured exposure rate. If it is assumed that the village area will be essentially cleared and covered with crushed coral as is customary, it would seem that an expected reduction of the mean exposure rate by a factor of two would be a conservative estimate. Figures 19 and 20 show the integrated exposure for the village and in- terior areas. (The beach is assumed constant at <10uR/hr). By making assumptions as to the residence time in each domain, the external gamma dose may be estimated. If the following assumptions for residence time are taken, the integral (at any age) dose to children born on Bikini in 1970 would be shown by Table 5. 33