BACKGROUND £ c 8 o 3 5 = 70 T 5 fA. 5 300 Ii VL 8 1Ooo0} Q SA | 800 SL £ T EUPHAUSIID STYLOCHEIRON ia 60 ew oO = 400 E / M 200 % — ON is a \ 2 3 4 5 6 7 8 3 Photon Energy in mev Figure 3 Gamma energy spectra the solid fraction (drained zooplankton) then in the filtrate. More details are given in Table 2 which sts the ratio of the specific activity of each fraction of the organic muterizl to that of the supernatent liquor. The analyses of sea water samples taken in this area are still considered classified data and cannot be discussed here in such a way as to give more information concerning the concentrating ability of plankton tu iallout materials. Furtherruore, the analysis of 13