Table ll. Comparison of soil-root and soil-leaf concentration factors. Concentration Factor, (pCi/g dry plant)/(pCi/g dry soil) ~ 90... Species Roots Pandanus 0.88 _ 137 a, 71 239, 2405, Roots Leaves Roots Leaves 1.0 23 17 0.44 0.015 0.77 1.2 26.1 0.45 0.022 Messerschmidta 0.59 0.48 33 0.44 0.35 Coconut 0.16 QO.11 2.3 0.085 --— 0.89 _--> 0.88 O.14 --~ 0.30 0.30 5.7 L.l 0.081 --o 0.89 —-> 5.0 0.38 -“-- 0.425 1.10 0.026 0.027 0.006 Banana a Leaves . 2.9 50 3.4 16 --- 0.54 Root and crown. Below minimum detection Jimit. consider it to be a valid sample and fruit sampled from this species are have used it in our dose predictions. 0.76 for 906. and 7.0 for Polos, Breadtruit — Breadfruit were not available on Enewetak Atoll. Papaya — The ratio of maximum-to- Thus, minimum concentration factors calcu- data from the two samples collected lated during the 1975 Bikini survey provide the leaves is small; . first directly measured concen- tration factors. for mature papaya As expected from the median concentration factors 90. 137 are 1:3 for Sr, 3.1 for Cs, and 239, 240 Concentration 0.0018 for ° Pu. 1972 Bikini survey? and from the sta- 1 factors of 0.43 for ble element analysis of potassium and Thee, and 0.0018 for 239,240), | are calcium in the Enewetak survey, calculated for the four papaya fruit of 90 sr and 13? uptake : Cs by breadfruit is available. Banana ~ The only data from the Preliminary concentration fac- tors of 1.8 for and 0.027 90 Sr, 1.6 for 1975 Bikini survey on radionuclide Cs, concentrations for 239, 240 Pu are assigned mature leaves. The two available samples suggest tentative concentra- to mature breadfruit centration L37 Say 8.2 for ?¢ high and comparable to uptake by Pandanus. Ie Sr, Factors leaves. for the one The con- . tion mature —27- in banana are for factors of 0.73 for 90.Sr, 9.42