TABLE B-1-4. COMPUTATION OF THE BRUSH ATTENUATION FACTOR FOR 241lAam Stake No. 7-N-1 6-N-1 5-N-1 5-S-2 6-S-2 6-8-1 4-N~1 4-8-3 7-S-1 5-S-3 241 am 241 am 18.9 20.3 17.2 18.1 Cleared Unclear 20.6 13.3 16.2 16.2 18.57 22.4 13.2 45.1 17.3 11.8 13.5 14.8 17.8 21.0 12.4 35.9 Clear Area, % Road, % 0.055 0.086 0.174 0.174 0.0 0.049 0.054 0.0 0.0 0.0 0.0 0.140 Total Clear, % 0.229 0.260 0.174 0.174 0.174 0.174 0.174 0.174 0.174 0.174 0.174 0.223 0.228 0.174 0.174 0.174 0.174 0.315 Brush 100% Brush Ratio = Cl8"__ Radiation Radiation 12.872 12,822 16.695 17.327 13.716 8.834 9.806 11.981 14.569 17.102 10.103 21.693 100% Brush 1.132 1.172 16.605 11.369 12.703 14.505 17.638 20.705 12.231 31.667 1.240 1.170 1.275 1.117 1.053 1.082 1.079 1.424 9-1-d Attenuation Factor, x = 1.147; o= 0.075; o/x = 6.5% TABLE B-1-5. COMPUTATION OF (ft74) AN ATTENUATION COEFFICIENT I= 100% Brush Io = Clear 7-N-1 6-N-1 16.7 17.3 6-S-1 4-N-1 4-§-3 T-S-1 14.5 17.6 20.7 12.2 Stake No. 5-N-1 5-S-2 6-S-2 (pCi/g) 16.6 11.4 12.7 Average X= 0.020; ¢= 0.013; o/x = 65.6% (pCi/g) l/lo 1-(I/Io) t=ft = 18.9 20.3 0.883 0.852 0.12405 0.15836 8! 8 0.015 0.020 16.2 18.6 22.4 13.2 0.895 0.946 0.924 0.924 0.1105 0.0515 0.07869 0.07620 6! 10' 10' 6' 0.018 9.005 0.008 0.013 20.6 13.3 16.2 0.806 0.857 0.784 0.21560 0.1568 0.24320 10' 3° 5° 0.022 0.031 0.049