Table 1. Plutonium concentration in two soils from Area 11 (activity in dpm/g of < 2 mm soil particles; + value is one standard deviation) Depth (cm) ’ Desert Desert 7,520 + 1,976 13,875 + 2,325 Pavement Mound O- 2.5 2.5 - 5.0 126 + 107 7,492 + 591 5.0 = 7.5 53 + 55 1,655 + 183 7.5 - 10.0 227 + 108 174 + 88