under present U.S. standards. Areas G, F, etc., have decreasing levels. Superimposed on this figure are locations of the soil samples taken. These samples will not only provide further detailing of the extemal dose but will establish a basis for determining a part of the food chain uptake of radioactive isotopes. In addition to the aerial and soil surveys, we have taken many samples of the lagoon water and bottom as well as the flora and fauna throughout the atoll. Figure 4 is another example from our aerial survey, showing Engebi (or Janet) Island. Only the contours are shown on this viewgraph. In order for the AEC to determine the total dose to man, we must know something about how he lives. Consequently, as a part of the survey, we are conducting a lifestyle study. We will attempt to detail the food chain as well as living, working, and recreational habits of the people. This lifestyle study is the bridge between a mass of data and the physical effect on people. Figure 6 graphically represents the progress of the survey analysis as of June l. As you can see about 4,200 separate samples were taken from the atoll and are being analyzed. Except for the water samples, each one must be dried, ground, tagged, and packaged, a process labeled preparation. Once prepared, the samples receive a gamma analysis/ are asSigned a number which is entered into a data bank. From there they are sent to one of the participating laboratories where detailed chemical analysis will determine the levels of such isotopes as 239 Pu, 137 Cs, 60 Co, and 90 Sr.