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