- 4 pectively, were approximately 7 miles per day (Seymour 1957 and Lowman 1960). The estimates, although similar, could be in error because the precise time or place of fallout into the ocean was not known, nor the center of the fallout area, nor the exact direction of the flow. Current movement as measured near Eniwetok Atoll in 1958 with a surface drogue was 17 miles per day. The rate of advance of radioisotopes in water would be expected to be Slower than the surface current because of eddy diffusion and turbulence. The amount of radioactivity in the water was also measured. For radioactivity produced in the Castle series, the maximum value reported by Miyake was 91,000 disintegrations per liter at a station 350 miles west of Bikini Atoll, 110 days after March 1, 1954; and the maximum reported by Harley was 570 a/m/1 off the coast of Luzon, 2,600 miles from Bikini, about 400 days after March 1, 1954. For the 1956 test series (Redwing), the maximum value was 120,000 d/m/1 (Donaldson et al.1956). The sample was taken north of Bikini of fallout that was believed to be three weeks old. Maximum values per se are not meaningful unless related to the time and place of origin of the radioisotopes in the sample.