~ 23 At Janet Island, which was washed by the water wave from the detonation, wi85 accounted for 53 per cent of the total radio- activity in top soil (Table 3). The contamination by this isotope is assumed to have been produced in the May 26 detonation. Analyses were made of soil samples taken at two depths (top inch and 8-inch to 10-inch depth) at Belle Island to determine the relative rate of leaching of wi85 through coral soil in comparison to that of Ce, samples, Ru and Zr. Based on these the radioelements leached through the soil in the following order (Fig. 7). Per cent of activity at 8 - 10 inches compared to surface activity wi85 2.1 Ryl03+106_ pp103+106 8 Zr95~Nb95 cel41+144_ p.141+144 5 4 w185 leached from the top. inch of soil to a depth of 8 to 10 inches two and one-half times as fast as radioruthenium, four times the rate of radiozirconium and five times as fast as radiocerium. The above conclusions are valid only if all four of the radioelements were deposited on the ground at approxi- mately the same time.