Analytical data from one of the four laboratories (Laboratory D) that analyzed samples from the Northern Marshall Islands Radiological Survey did not, for the most part, meet the quality contro! criteria established for the analysis of samples. These data, which represent about 18% of the total wet chemistry analyses performed by all four laboratories and 55% of the work performed by Laboratory D, were not accepted by 90, 2394240 LLNL. Thus, there are some islands in the following tables where Pu, or 24) Am concentrations are unavailable. These missing data are identified by dashes. Data for these three radionuclides are available, however, for the residence islands at each atoll. The 80% of the wet chemistry data from all laboratories that did meet our quality control criteria ‘is sufficient to give an evaluation of the 995, 23942405, and 24k A concentrations at most islands and atall atolls. The 137 Cs concentration data for all samples is complete. This radionuclide accounts for more than 90% of the estimated doses in the Marshall Islands.