%. -1l2- Figure shows island 7 1000 soil ISLAND . decline slopes at sites other than Belle. Pre-Nectar levels are indi- ALICE SOIL JANET OLIVE VERA 10of cated by short 0 horizontal bars at the left edges of the graphs. Except at Bruce and Elmer, the points are widely scattered and the trends poorly defined. Vari~ ations in exact 3 taking, changes of * location of sample personnel, and the use of single samples contributed to this variability. Levels of radioactivity were much higher at the northern than at the southern localities. op : | BRUCE 2 ELMER 1 HENRY LEROY | 100 tt » ‘fr = 01 \ - 1 . { . a { 100 10 DAYS AFTER mAY 14, 1954 100 16 100 Fig. 7 Table 3 gives decay slopes of island soil samples from various islands over a time span of from one or two months to more than two years. ing -0.9 f 0.02. Slopes ranged from -0.6 to -1.3, averag- since the five soil decay curves with more than two points are fairly straight lines, 2-point slopes were used to expand the scope of observations. The period of time covered by the decays is close to that of the declines. Table 3 shows that declines were steeper than decays except at Janet where decays were steeper, and at Vera where decay and decline were equal. my OF At C Hi 1VES 1000