1 O00 F- cot t T - © p > ; = 2B | 5 }- a Cc @ _ m7 S/c, 4 79s, 1) (2) 7 < vo y ratios HFH 4, Enewetak, , 239,240 Pu concentra- tions in the surface groundwaters of _ | any island and its median soil inventory. 4 The relationship is é 239,240), (fCi/litre) in 10 filtered surface ground- J water = ? 70 the center we developed a relationship between the mean 4 qld north of From our groundwater studies at 4 J and HFH 5, baseline road. = 4 (averaging 0.004) are found in the groundwater at wells HFH 3, : a In Pu levels. 40 238. 239,2 9, We oy Pu/f lowest the general, | (8) 239,240 1.34 of the 7 “a L o < Tr J ¢ SE Cc ~~ (4) r 0 oH} ; 100 oS +> | | | 72 7A 76 (8 £ 4.9 x 10°?) dg 39,240), (mCi / kan”) in the respective island soil column to a depth of 125 em. If Year of collection this relationship is applicable to any Pacific atoll where similar Fig. 5. Changes in groundwater concentrations of 43/cs and Sr with time at Bikini Island. Numbers in parentheses are the number of samples analyzed. in the groundwater reservoirs if mechanisms are moving plutonium to the groundwater reservoirs, be used the to predict soll inventories from groundwater data. The mean centration of 239,240), , in fraction is 27.6 ([Ci/litre. ulations using this water are to be and properly assessed. estimate ment of Sou in . concentrations a 238 The Pu of 38 - concentrations Pu are . in tion in . low. 6.4 the median soil inven- The mean concentra- the groundwaters at Iineu is fCi/litre which, median -~L7~ wt that relationship, the soluble fractions average about é Using this value the above relationship, we x 10° mCi fem the measure- the water samples, ; the soluble tory on Bikini Island is 3.5 + 1.3 there are significant errors associated with the con- in the Bikini groundwater long-term radiological doses to pop- Although it can soil with indicates burden on the above that che Eneu will be