OFFICIAL USE ONLY II. A. GROSS ACTIVITY Land Plants Graph Two indicates the general levels of activity of edible plants (pandanus, papaye, breadfruit, arrowroot) » and coconut meat and . milk at Rongelap Atoll together with their decline of activity with time .1?* Tables One and Two show first survey in February 19557 the analyses made by NRDL for the Table Three is based on the February 1956 survey.’ Tables Four, Five and Six show the analyses by HASL.?” 6 The high initial activity of the "edible plants” (Graph Two) was probably due to surface contamination caused by the direct fallout. The rise in activity after « year after the fallout occurred may be due in part to sampling and counting variances but probably results from the ability of some plants to concentrate cst3? (see Section Radiochemical Analysis), or may represent a condition of increased availability of the radioactive fallout material to the plants. Initially the activity in the coconut milk and meat was less than other edible plants but the rate of decline of activityhas been less than for other edible land piants probably due to the higher percentage uptake of this longer-lived cgtst . 5002089