much more uniform over the small the levels of those radionuclides areas encompassing the three build- found in the cistern samples. ings attached to the cisterns. Shown in Table 3 are the As additional support for Osy con- this argument, water samples from the centrations in rainfall at several drinking water tanks of the L.C.U. Pacific islands between 1968 and 1974. support boat R. When the six-year mean values are during this expedition to Bikini plotted as a function of latitude, have been analyzed for the interpolated mean quantity of 239,240), fallout 706. expected in rainwater derived from rainwater catchment at the latitude of Bikini Atoll is systems at Kwajalein Atoll. only 0.1 pCi/litre. October 1975 this fresh water con- have, on the average, -concentration. The cisterns 15 times V. Liktanur used "Cs and This drinking water is During tained 0.6 + 0.2 fCi/litre 239,240, 1 137 this and 90 + 40 £Ci/litre Since the cisterns Cs. These were constructed after 1969, we can values are thus representative of only conclude that fallout 705. and the fallout levels in rainfall in by analogy 137 oO. and the Marshall Islands. 239,240, u, con- tribute only a small percentage to Table 3. and 137 Cs Jevels in C 106, in yearly rainfall (pCi/litre) The 239,240), | . this water are a Six- 1968 1969 1970 1971 L972 1973 . 1974 0.35 0.47 0.44 0.35 0.28 0.07 0,25 0.32 Johnston .36 251 .26 54 (14 Q5 68 36 Guam .20 -Lli .13 ~13 .10 . 0? .10 Lil Yap 12 07 LLL _ 07 .05 . 008 .O7 .O71 Truk 08 08 LO 08 03 .003 . 06 .061 Koror .095 mera 07 07 .05 .003 06 .O55 Majuro Jil 09 14 .O9 .03 . 006 Ponape 0.08 0.07 0.09 eke) 0.03 0.008 Island Wake “Data from Ref. . 06° 0.05 year mean 2875 6.061 ll. -10- es