16. TECHNICAL PROGRESS IN FY 1975: This is a new effort. However, a preliminary report, similer to the nf Enewetak evaluation, was developed for Bikini andaN p presented to DOS. In addition, we have been working continucusly witn DBSER and DOS 5 on followup assessments relative to interpretation of NVO-140 data and cther matters involving Enewetek and Bikini. 27... EXPECTED RESULTS IN .FY 1975: A. Enewetak Atoll lots, both woulé b slebiiity oP regular and clean-bed, on the northern islands collected, leached, serareted end fracticnated radionuclides to vlants end to assess tne soil are associated. Esth organic end inorganic so and the radicnuclide concentration in scil war will be evalustea. the redicnuclides pe angivcea surface to lena: Also, in combinaticn wit: 2 assessment will be made of the turnover time o n 1 cess on dirrerent norhtern end scuthern islands. These data will lead to more general understanding of the cycling phenomena in the ete it ecosystem as well as to better essessment cf concentration factors for indicator viant ereciés now aveilablie on the islands. SBicmacs measurements will pe made Tor Ensebi and rerhers one of the edgacent isisnis. The rate of litter fell and of litter ¢ ec ed for @ nonesriculturel situation cn Engebi. The results will be use Ground kinetics leading to radionucliée input into the systen, B. Bikini Atoll The initial trip to the Atoll would establish the necessary experirental plots and the necessary susvorting eauivment for sampling collecticn end cample processing. t is expected that three trics per year will be required for the next few years to complete the experiment and to obiegin the necessary samples. Initial samples of banana and papaya will be collected, along with corresponding soil samples, and returned to LLL for analysis. ,ew concentration factors will be developed from these date end the soil fractions containing the activity will be define Also, the measured concentretions in the fruits will be comsered to predictions based uron the approach used in NVO-140 end tre preliminary Bikini asse ssment to test the eccuracy 0 of the predicted concentrations in fruits and the doses based woon these predictions. Experiments to measure litter-fall and litter-decay rates in an agricultural system will be initiated during FY 1975.