Interim Baseline Radiological Investigation Report
November 14, 2012
Bear Lodge Project, for Rare Element Resources, Ltd.
Rev.1
32
Table 7.1. Ambient Radon Concentrations in Air
Radon-222 Results (µCi/ml)
Location
Starting Date Ending Date Concentration
Error ±
1σ
LLD
Average
Standard
Deviation
Minimum
Maximum
Percent
Effluent
Conc.
AMS-1
11/9/11
1/20/12
8.00E-10
0.06
4.17E-10
4.50E-10
2.38E-10
3.00E-10
8.00E-10
800
2/14/12
4/4/12
4.00E-10
0.04
6.00E-10
400
4/4/12
8/9/12
3.00E-10
0.02
2.36E-10
300
8/9/12
10/1/12
3.00E-10
0.03
5.66E-10
300
AMS-2
11/10/11
1/20/12
8.00E-10
0.06
4.23E-10
5.30E-09
5.60E-09
8.00E-10
1.32E-08
800
2/8/12
4/4/12
1.90E-09
0.12
5.36E-10
1900
4/4/12
8/9/12
5.30E-09
0.14
2.36E-10
5300
8/9/12
10/1/12
1.32E-08
0.35
5.66E-10
13200
AMS-2*
11/10/11
1/20/12
7.00E-10
0.05
4.23E-10
2.37E-09
2.39E-09
7.00E-10
5.10E-09
700
2/8/12
4/4/12
1.30E-09
0.09
5.36E-10
1300
4/4/12
8/9/12
5.10E-09
0.15
2.36E-10
5100
-
-
-
-
-
-
AMS-3
11/9/11
1/20/12
8.00E-10
0.06
4.17E-10
3.75E-10
3.10E-10
1.00E-10
8.00E-10
800
1/30/12
4/4/12
4.00E-10
0.04
4.62E-10
400
4/4/12
8/9/12
1.00E-10
0.01
2.36E-10
100
8/9/12
10/2/12
2.00E-10
0.02
5.56E-10
200
AMS-4
11/9/11
1/20/12
9.00E-10
0.06
4.17E-10
5.25E-10
2.63E-10
3.00E-10
9.00E-10
900
2/2/12
4/4/12
4.00E-10
0.04
4.84E-10
400
4/4/12
8/9/12
5.00E-10
0.03
2.36E-10
500
8/9/12
10/2/12
3.00E-10
0.03
5.56E-10
300
