Interim Baseline Radiological Investigation Report in
Support of the Upton Rare Earth Processing Plant
November 15, 2012
25
Table 5.2. QA-QC Comparisons: RPD and RER Summary
Radionuclide Concentrations
Sample ID
Type
Ra-226
(pCi g
-1
)
Ra-226
Error ± 1σ
Uranium
(mg kg
-1
)
Thorium
(mg kg
-1
)
SS-12-SS-061412
Sample
1
0.3
2
11
SS-17-SS-061412
Replicate
1.4
0.5
2
11
RER
0.7
-
-
-
RPD
-
-
0
0
SS-07-SS-061412
Sample
1.8
0.5
2
13
SS-18-SS-061412
Replicate
1.8
0.5
3
14
RER
0.0
RPD
10
1.9
SS-10-SS-061412
Sample
1.8
0.6
3
15
SS-19-SS-061412
Replicate
1.5
0.5
3
14
RER
0.4
RPD
0
1.7
SS-13-SS-061412
Sample
1
0.3
1
6
SS-20-SS-061412
Replicate
1.6
0.5
2
7
RER
1.0
RPD
16.7
3.8
In this table, RER corresponds to the Replicate Error Ratio and RPD corresponds to the relative percent difference, which is derived by dividing
the difference between the two results by the average result.
mg kg
-1
= milligrams per kilogram
pCi g
-1
= picocuries per gram
σ = standard deviation
