Arrowroot stems and leaves show a considerable amount of activity but the ratio of the activity in the supporting system to that in the edible part is much less than for coconuts. This is understandable when the relative amounts of fruit and supporting system in both instances are considered, 2.2.3 Soil Exposed soil profile, tube coring, and gross samples were collected to describe the distribution of activity in the island profiles and especially in the areas of extensive food plant production. ; A summary of the beta activity in gross samples of soil is given in Table 2.3, Table 2.4 presents data obtained from exposed soil profiles. The probability of cross-contamination in these samples was small. TABLE 2.3 Summary of Beta Activity in Gross Samples of Soil Beta Activity (PB/min/g) . Depth of Soil «Grol in, - lto din. Likiep 1 90 Utirik 4 960 §50 Rongelap 3 8,900 800 Enjaetok 2 48,000 640 Labaredj 3 85,000 1,300 Kabelle 6 96,000 3,100 Gejen 1 348,060 12,409 Bikar 1 8,400 $0 Eniwetak 1 12,000 240 _— Island Number of Samples ge ° we pale ‘. oh 3 FQ 16