ee ee ee association of plutonium with sinking narticles is of major importance in the marine distritution of nlutonium. (Z) The mean ratio of Pue?®;py2 394240 in the @)series samples was (0.920 + 0.904) which agrees well with the ratio of 1.924 used by Hardy, Kray and Volchock (Nature Vol. 241, 444, 1973) as an average weapons pu238/ Pu2*9*249 vatio (Fie. 2). (4) The concentration of plutonium in the (Q (crater) sanples varied from 79 ZR average Pus - 2°70 dpm Pu239*240 pranat, and the 22Q47AN spurs ete 4 ratin in these samnles was (O.N5& + ANA) which is much higher than the mean of the ~ P series samrles. (S) In theQyY series samnies the concentration of plutonium was the lowest found in this suite of samples. The Pu content varicd from 4 - 16 drm PuZ39*240/10n0L, except in })-9 surface samrle, which was collected in the Tokororyuru Pass and which contained 97.4 + 6.8 d/m Puz3°*+240 yinanoy. The high value in this sample reflects surface flow of water out of the lagoon to the west. The average Pu->8/py259*240 ration was (0.941 + .917) in the open-sea samples. (6) The water from the Zuni and Rravo craters exhibited high Py 238 pp,239 ratios (Zuni surface 9.13; Pravo surface 9005930