Interim Baseline Radiological Investigation Report
November 14, 2012
Bear Lodge Project, for Rare Element Resources, Ltd.
Rev.1
29
Table 5.2. QA-QC Comparisons: RPD and RER Summary
Radionuclide
Ra-226 (pCi/g)
Ra-228 (pCi/g)
Sample Location
Result
Error ± 1σ
Result Q
Error ± 1σ Q
RER
Result
Error ± 1σ
Result Q
Error ± 1σ Q
RER
SS-08-SS-081211
1.4
0.5
1.6
0.5
0.26
3
0.7
0.3
0.3
3.04
SS-28-SS-081311
0.3
0.3
0.3
0.3
0
0.3
0.3
0.3
0.3
0
SS-33-SS-081311
3.4
0.7
3.1
0.6
0.26
5.1
0.8
5.4
0.8
0.19
Radionuclide
Th-228 (pCi/g)
Th-230 (pCi/g)
Sample Location
Result
Error ± 1σ
Result Q
Error ± 1σ Q
RER
Result
Error ± 1σ
Result Q
Error ± 1σ Q
RER
SS-08-SS-081211
0.7
0.2
0.9
0.3
0.50
0.3
0.2
0.4
0.2
0.34
SS-28-SS-081311
0.1
0.09
0.08
0.09
0.16
0.2
0.1
0.2
0.1
0
SS-33-SS-081311
2.2
0.5
2.7
0.6
0.53
1.6
0.4
1.6
0.4
0
Radionuclide
Th-232 (pCi/g)
U-nat (pCi/g)
Sample Location
Result
Error ± 1σ
Result Q
Error ± 1σ Q
RER
Result
Result Q
RPD
SS-08-SS-081211
0.7
0.2
1.2
0.3
1.20
1.67
1.73
0.04
SS-28-SS-081311
0.03
0.06
0.06
0.08
0. 30
0.81
0.87
0.07
SS-33-SS-081311
2.1
0.5
3.3
0.7
1.15
10.88
8.55
0.24
In this table, "Q" denotes the QA-QC counterpart listed in the preceding table for each sample location. RER corresponds to the Replicate Error Ratio.
RPD corresponds to the relative percent difference, which is derived by dividing the difference between the two results by the average result.
