Because the range of concentration Several reasons explain the varia- factors in only two combinations of tion of concentration factors calcu- nuclide, plant part, and species from lated from associated plant and soil the associated soil-plant data (pooled data, Seaevotla-Messerschmidta leaves for physiochemical properties of the IS tos and papaya leaves for aay radionuclides under consideration, varied by more than a factor of 20 soil. type and chemical characteris- (Table 10), we use the median concen- tics, in soil management practices, tration factors derived from the in irrigation practices, and in the 5 including differences in the physiology, age, and prior history of “associated data in our predictive the plants sampled. model. Table 10. in It is impossible Maximum-to-minimum ratios of associated soil-plant concentration factors. Species, Organ oY 1370. 239, 5 240, Secaevola, mature leaves L. 10 ---" --~ .. 23 4.9 2.6 leaves 3. 39 Pandanus, mature leaves 3.7 Coconut, 3. Maximum-to-Minimum Ratio Messerschmidtid, mature leaves Pooled Seaevola and Messersenmidia, mature x . Coconut, mature leaves tle * onb Fruit < 7. 8.4 14 , 2.6 20 23 2.0 6.9 3.6 2.) 1.8 oo --- 30 7.9 Papaya, mature leaves 6. Papaya, fruit ?. 9.5 1.7 1.8 Banana, mature 2.2 1.6 3.2 3.8 Ll. 3.0 3.0 2.9 f ayy tae sreadf[ruit, ? al Wot vw Leaves I: mature leaves* detected. Fruit'’ includes both meat and milk. : . ~ ~24—