Interim Baseline Radiological Investigation Report
November 14, 2012
Bear Lodge Project, for Rare Element Resources, Ltd.
Rev.1
33
Table 7.1. Ambient Radon Concentrations in Air (concluded)
Radon-222 Results (µCi/ml)
Location
Starting Date Ending Date Concentration
Error ±
1σ
LLD
Average
Standard
Deviation
Minimum
Maximum
Percent
Effluent
Conc.
SGS #1
11/10/11
1/20/12
3.00E-10
0.02
4.23E-10
7.75E-10
4.65E-10
3.00E-10
1.40E-09
300
2/6/12
4/3/12
6.00E-10
0.06
5.26E-10
600
4/3/12
8/2/12
8.00E-10
0.8
2.48E-10
800
8/2/12
10/2/12
1.40E-09
1.4
4.92E-10
1400
SGS #2
11/10/11
1/20/12
6.00E-11
0.06
4.23E-10
1.04E-09
1.06E-09
6.00E-11
2.50E-09
60
1/6/12
4/3/12
5.00E-10
0.05
3.41E-10
500
4/3/12
8/1/12
1.10E-09
0.06
2.50E-10
1100
8/1/12
10/2/12
2.50E-09
0.12
4.84E-10
2500
SGS #3
11/10/11
1/20/12
1.20E-09
0.08
4.23E-10
1.40E-09
5.48E-10
8.00E-10
2.10E-09
1200
2/8/12
4/3/12
8.00E-10
0.07
5.45E-10
800
4/3/12
8/1/12
1.50E-09
0.07
2.50E-10
1500
8/1/12
10/2/12
2.10E-09
0.11
4.84E-10
2100
SGS #4
11/10/11
1/20/12
2.00E-10
0.02
4.23E-10
1.03E-09
8.50E-10
2.00E-10
1.90E-09
200
-
-
-
-
-
-
4/3/12
8/2/12
1.00E-09
1.0
2.48E-10
1000
8/2/12
10/1/12
1.90E-09
1.9
5.00E-10
1900
SGS -#7
-
-
-
-
-
1.30E-09
2.65E-10
1.10E-09
1.60E-09
-
3/5/12
4/3/12
1.10E-09
0.11
1.03E-09
1100
4/3/12
8/1/12
1.20E-09
0.06
2.50E-10
1200
8/1/12
10/1/12
1.60E-09
0.09
4.92E-10
1600
