and/or narrow islands, however, a correction is required for the aerial measurement and uncertainty is introduced in the final average concentration from the aerial measurement (Tipton and Meibaum, 1981). The maximum difference observed between the two methods is about a factor of 3 or 4 for smaller islands, and, because of the uncertainties in the two methods, it is reasonable to assume that the average !3’Cs surface soil concentration is somewhere between the results listed for the two methods. more soil profile samples are collected and analyzed, the As average concentration will probably approachwthe average concentration determined by the aerial measurement. , Listed in Appendix B (Tables B-1 to B-14) are the comparative results of the individual soil profiles for each island on Bikini Atoll corresponding aerial activity contour. how well the soil and the This comparison gives a better idea of profile data match the aerial data because each sample is compared with the associated aerial contour in which it is located rather than the island average. Thus, the error introduced by looking at island averages where no soil profiles were taken in the center of the island is eliminated. It does not, of course, improve in any way the resolution of the aerial System, so there is still an averaging effect within a contour. Also, | an uncertainty still exists in the precise location of the soil profile sample and the small size of the soil profile. The sample locations were marked on maps carried by the field teams but they are approximate ' locations (see Appendix A). The exact location of the soil profile sample could easily be several meters from where we have it recorded on the maps. Thus, when the location is near the boundary of two or more contour regions, the true soil profile location could fall in any of the nearby aerial contour regions. We would expect, therefore, that the correlations would not always be exact because of the uncertainty in the soil profile location and also because the soil profile analysis involves a very small area of the soil surface, while the aerial measurement integrates a much larger surface area. Overall, the correlation between the soil profile and aerial results are reasonably good. The median and mean radionuclide concentrations for '37cs, 99sr, 239+240py and 24lam for each island for each soil increment to a depth of 60 cm are 5000325. given in Tables 5 to 30. Data are also given for. the average 19