Interim Baseline Radiological Investigation Report
November 14, 2012
Bear Lodge Project, for Rare Element Resources, Ltd.
Rev.1
38
Table 8.1. Radionuclide Concentrations in Filters (concluded)
Sample Collection
Concentration
a
Lower Limit of Detection
Location
Start Date
End Date
U-nat
(µg/f)
Th-230
(pCi/f)
Th-230
error ± 2σ
Ra-226
(pCi/f)
Ra-226
error ± 2σ
Th-nat
(µg/f)
U-nat
(µCi/f)
Th-230
(µCi/f)
Ra-226
(µCi/f)
Th-nat
(µCi/f)
AMS-03
11/16/2011
12/5/2011
1
0.61
0.40
0.5
0.7
5
8.0E-5
0.54
1.1
0.02
12/12/2011
12/30/2011
1
0.90
0.58
-0.07
0.6
5
8.0E-5
0.85
1.1
0.02
1/5/2012
1/30/2012
1
0.56
0.36
0.6
0.6
1
5.0E-5
0.48
0.8
0.02
2/13/2012
3/5/2012
1
0.39
0.31
2.2
0.8
2
5.0E-5
0.49
0.9
0.02
3/9/2012
3/26/2012
1
0.37
0.34
1.8
0.8
3
5.0E-5
0.55
0.8
0.02
3/30/2012
4/20/2012
1
0.99
0.49
0.05
0.7
2
5.0E-5
0.58
1.2
0.02
4/30/2012
5/21/2012
1
1.4
0.56
0.5
0.5
2
8.0E-5
0.57
0.5
0.02
5/24/2012
6/15/2012
1
0.62
0.38
1.0
0.5
2
8.0E-5
0.49
0.6
0.02
6/25/2012
7/13/2012
1
1.5
0.56
0.8
0.5
5
8.0E-5
0.56
0.6
0.02
AMS-04
11/16/2011
12/12/2011
1
2.2
1.6
0.9
0.8
8
8.0E-5
2.3
1.1
0.02
12/19/2011
1/9/2012
1
0.94
0.47
4.3
1.0
2
5.0E-5
0.54
0.8
0.02
1/13/2012
2/6/2012
1
1.1
0.49
5.2
1.2
2
5.0E-5
0.52
0.9
0.02
2/19/2012
3/30/2012
1
0.52
0.37
4.1
1.0
3
5.0E-5
0.53
0.8
0.02
4/6/2012
4/24/2012
1
0.96
0.52
3.7
1.1
1
5.0E-5
0.62
0.9
0.02
5/7/12
5/24/12
1
0.75
0.44
0.9
0.4
2
5.0E-5
0.58
0.5
0.02
6/1/2012
6/25/2012
1
0.93
0.44
0.9
0.5
6
5.0E-5
0.62
0.9
0.02
6/29/2012
7/25/2012
1
0.65
0.41
0.8
0.5
3
5.0E-5
0.62
0.9
0.02
Notes:
a
Bolded values were reported by the laboratory as not detected.
pCi/f = picocuries per filter
Ra-226 = radium-226
σ = standard deviation
Th-230 = thorium-230
Th-nat = natural thorium
U-nat = natural uranium
µCi/f = micocuries per filter
µg/f = micrograms per filter
