uptake experiments indicate much lower root uptake discrimination factors (Pu plant/Pu soil) than those Pu vegetation/soil ratios found in samples collected from the aged plutonium fallout areas. There is need to quantitatively verify the first of these assumptions through integration of findings from the resuspension and vegetation element studies. If it should result that the first assumption indicated above proves to be groundless, then the possiblility must be seriously considered that somehow, the perennial vegetation in these aged plutonium areas has been concentrating the transuranic elements in roots and stem tissues in forms that can be rapidly translocated to each new flush of foliage. Sampling to verify such a process will be difficult under field conditions due to cross contamination. Long- term root uptake studies now in progress with alfalfa and Atriplex eaneseens should contribute helpful information on this matter. FUTURE ACTIVITY PLANS Efforts shall be directed toward vegetation studies that will contribute information to help resolve those problems of concern mentioned above. Opportunities will be taken to report findings at scientific society meetings and symposia and to publish findings in the scientific literature. Projects involving problems relative to revegetation and restoration of disturbed arid lands shall be conducted in conjunction with future cleanup activities in the aged plutonium fallout areas. 34