113 the detonation. tlowever, as noted by Welander (1966), currents were capable of maintaining a large flow of finely divided sediment out of certain craters at Eniwetok long after testing stopped. It is quite likely that a signifi- cant amount of this material has been deposited outside the crater in the large areas between the craters and the stations sampled, and is the source for the materia] which has been redistributed lagoonwards. The 23942405, 238, ratios measured in the craters and at various stations in the northwest quadrant suggest three possibilities for the source of the redistributed material deposited at Station B-2: (1) from locations between Station B-2 and the Bravo Crater, (2) from (1) above and from the area between Station B-2 and the northern reef (near Station B-19), or (3) from (1) or (2) above and also from within the craters. The logic of this hypothesis follows from the ratios in the 11 cm of redistributed sedifindings that the 23942405,,.238py Pu: ments at Station B-2 are about 80, whereas the ratios measured in the fine sediments collected in Bravo Crater sediments are about 20, and the ratios at Station B-19 are about 125. Presently, the possibility of a large-scale loss of contaminated sediments from within the Bravo Crater is not indicated from the data of Schell (1975b). He found 95 T.U (3H) in the deep waters of Bravo Crater and only 4 T.U., which is similar to the concentration of ocean water, in the surface waters of the crater, indicating a lack of mixing between the surface and deep waters. Because mixing would be required for the suspension and loss of particulates over the lips of the crater walls, which surround the crater, sources outside the Pravo Crater are suggested for sediments being redistributed towards Station B-2. At Station B-20, the very high 23942405, ratios found (and other evidence as discussed in Section 5.1-7) suggest that a Singular source, closer to Station B-19, is (or was) the source for the old