qT | | _ oO 46 3.6 O a | Eniwetok 910.3 - o19 , 960, 04.8 ° O _ 32 . ° 7.6 . ; ‘SooO > Ids = 25 11°10" — Gross beta activity 106 d/m/g of dry plankton Z 11°00" _ O of +5 oO 6,9 a 161° 20! ! I,tc 03.2 161°30" | o 161°40! | 161°50! | 162°00! oY, fe wy ht Figure 5. Gross beta activity of the post-Wahoo plankton samples. | 162°10! i -2c- 279 O12 o