Interim Baseline Radiological Investigation Report
November 14, 2012
Bear Lodge Project, for Rare Element Resources, Ltd.
Rev.1
40
Table 8.2. Radionuclide Concentrations in Air (concluded)
Location
Sample Collection
Concentration (µCi/ml)
% of Effluent Concentration
Lower Limit of Detection (µCi/ml)
Start Date
End Date
Volume
(scm)
U-nat
Th-230
Ra-226
Th-nat
U-nat
Th-230 Ra-226 Th-nat
U-nat
Th-230
Ra-226
Th-nat
AMS-03
11/16/2011
12/5/2011
30419
2.2E-17
2.0E-17
1.6E-17
3.6E-17
0.001% 0.001% 0.002% 0.005%
1.8E-21
1.8E-17
3.6E-17
0.0E+00
12/12/2011
12/30/2011
29783
2.3E-17
3.0E-17
-2.4E-18
3.7E-17
0.001% 0.001% 0.000% 0.005%
1.8E-21
2.9E-17
3.7E-17
1.5E-19
1/5/2012
1/30/2012
36237
1.9E-17
1.5E-17
1.7E-17
6.1E-18
0.001% 0.001% 0.002% 0.001%
9.3E-22
1.3E-17
2.2E-17
1.2E-19
2/13/2012
3/5/2012
43432
1.6E-17
9.0E-18
5.1E-17
1.0E-17
0.001% 0.000% 0.006% 0.001%
7.8E-22
1.1E-17
2.1E-17
1.0E-19
3/9/2012
3/26/2012
37086
1.8E-17
1.0E-17
4.9E-17
1.8E-17
0.001% 0.000% 0.005% 0.002%
9.1E-22
1.5E-17
2.2E-17
1.2E-19
3/30/2012
4/20/2012
48393
1.4E-17
2.0E-17
1.0E-18
9.1E-18
0.000% 0.001% 0.000% 0.001%
7.0E-22
1.2E-17
2.5E-17
9.1E-20
4/30/2012
5/21/2012
35640
1.9E-17
3.9E-17
1.4E-17
1.2E-17
0.001% 0.001% 0.002% 0.002%
1.5E-21
1.6E-17
1.4E-17
4.4E-09
5/24/2012
6/15/2012
36094
1.9E-17
1.7E-17
2.8E-17
1.2E-17
0.001% 0.001% 0.003% 0.002%
1.5E-21
1.4E-17
1.7E-17
4.4E-09
6/25/2012
7/13/2012
29576
2.3E-17
5.1E-17
2.7E-17
3.7E-17
0.001% 0.002% 0.003% 0.005%
1.8E-21
1.9E-17
2.0E-17
4.4E-09
AMS-04
11/16/2011
12/12/2011
42156
1.6E-17
5.2E-17
2.1E-17
4.2E-17
0.001% 0.002% 0.002% 0.005%
1.3E-21
5.5E-17
2.6E-17
1.0E-19
12/19/2011
1/9/2012
34284
2.0E-17
2.7E-17
1.3E-16
1.3E-17
0.001% 0.001% 0.014% 0.002%
9.9E-22
1.6E-17
2.3E-17
1.3E-19
1/13/2012
2/6/2012
49620
1.4E-17
2.2E-17
1.0E-16
8.9E-18
0.000% 0.001% 0.012% 0.001%
6.8E-22
1.0E-17
1.8E-17
8.9E-20
2/19/2012
3/30/2012
40155
1.7E-17
1.3E-17
1.0E-16
1.6E-17
0.001% 0.000% 0.011% 0.002%
8.4E-22
1.3E-17
2.0E-17
1.1E-19
4/6/2012
4/24/2012
39193
1.7E-17
2.4E-17
9.4E-17
5.6E-18
0.001% 0.001% 0.010% 0.001%
8.6E-22
1.6E-17
2.3E-17
1.1E-19
5/7/2012
5/24/2012
28056
2.4E-17
2.7E-17
3.2E-17
1.6E-17
0.001% 0.001% 0.004% 0.002%
1.2E-21
2.1E-17
1.8E-17
1.6E-19
6/1/2012
6/25/2012
3941
2.4E-17
2.7E-17
3.2E-17
1.6E-17
0.001% 0.001% 0.004% 0.002%
1.2E-21
2.1E-17
1.8E-17
1.6E-19
6/29/2012
7/25/2012
13710
1.7E-16
2.4E-16
2.3E-16
3.3E-16
0.006% 0.008% 0.025% 0.042%
8.6E-21
1.6E-16
2.3E-16
1.1E-18
Notes:
Ra-226 = radium-226
scm = standard cubic meters
Th-230 = thorium-230
Th-nat = natural thorium
U-nat = natural uranium
µCi/ml = micocuries per milliliter
