radionuclides and pathways on the overall picture of radiological assessment for habitability at this time, and to provide data and interpretations which will guide clean-up assessment, These data, however, will not, in all cases, be sufficient to predict potential dosages over the long-term. This point is made to emphasize that limitations in the data base may exist which will not allow detailed pathway modeling and projection of infinite future dosages in all cases, Previous studies at Eniwetok provide a basis for developing a list of radionuclide species to be encountered in the measurements program (see Table 2). This list may not be complete, and the study may turn up other induced activities, Nevertheless, it is most probable that a small number of radionuclide species will lead to the majority of significant dosages as was found for Bikini. In addition to the transuranics, we expect 90 Sr, 13Tog, 606, and perhaps 9749 e to be major contributors to dosage, depending on the pathway considered and the circunstances. Most of this work of assessment will be straigntforvar’ and will consist of applying food~chain and dosimetric data well in hand in the literature and available in such sources as ICRP No. 2. However, we recognize the importance of the results of the measurement program in penerating new information on the transport and fate of the heavy elements and we also recognize our re- liance on other current research and evaluation activities in the areas of heavy element biological distribution md dosimetry in man, We plan to work closely with DBER and groups such as the NVOO Applied Ecology Group and the AIBS Advisory Cormittee on Plutcrium, particularly to interpret the significance of plutonium in the context of habitability and clean-up. III. EXTERNAL DOSE AND SOIL SURVEY: This soil survey plan is based largely on the draft plan dated 31 August 1972 developed through consultation among the following individuals: Drs. Seymour, Held, Nelson, Welanda, and Schell (Univ. of Wash.), Drs. Eberhart, and Gilbert (BNW), Mr. MeCraw (DOS), and Mr. Lynch (NVOO). The survey has been divided into four phases. Phase I is designed to identify any unsuspected radiological problems on the least contaminated islands. Phase II includes islands which have been subjected to fallout to various degrees (minor to somewhat severe) and conrtruction activities which