Table 4. Distribution of plutonium in size fractions and contribution of sizes to total soil plutonium in desert mound Sample Depth (cm) 0 Size Range (ym) Activity* 2,000-840 840-250 250-125 125-53 53-20 20-5 5-2 < 2 - 2.5 A B C 10,523 169 1.7 4,003 1,320 13.3 1,221 522 5.2 21,653 3,622 36.4 74,058 1,977 19.9 229,401 1,972 19.8 56,653 232 2. 29,221 137 1.4 2.5- 5.0 A B Cc 6,597 127 1.6 1,553 419 5.2 5,354 2,21] 27.5 6,193 1,350 16.8 64,525 2,368 29.4 70,809 1,232 15.3 25,517 212 2. 11,098 126 1.6 5.0- 7.5 A B Cc 1,069 16 0.8 541 133 6.6 851 325 16.2 1,117 255 12.7 15,496 606 30.3 16,484 522 26.1 4,834 93 4, 2,547 51 2.6 7.5-10.0 A B Cc 11 0 0.1 24 6 3.4 51 17 9.7 74 12 6.9 1,042 43 24.6 898 57 32.6 699 35 20. 144 5 2.9 *A = dpm/g in size fraction; B = contribution in dpm/g of soil, activity rounded off to nearest whole percentage contribution of activity in size fraction to soil. number; C