7
SS
Table 1. Allowable counting errors accorgng to the _ .
total activity in the sample received by <1e contracz 73
laboratories.
Radionuclide
pCi
239,240py
l-g error “%)
<0.1
50 to 1G
0.25 to 1
<20
0.1 to 0.25
>I
238,241py
<40
«10
¥
«2
50 to 166
2 to 5
<A0
5 to 20
<20
<0.1
50 to 100
>20
241 Am
0.1
«10
to 0.25
<40
0.25 to |
<20
>I
137¢5
<10
ral
50 to 100
1 to 5
<30
>8
«10
5 to 8
90Sr
<20
<]
50 to 100
1 to 5
<30
8
«10
5 to 8
80% of all
duplicate pairs
mo
included
<20
in each OCD,
Duplicate samples are
prepared and distributed by LLNL.
3.
The third ‘criterion
requires
that
the laboratories accurately
determine the radionuclide concentrations of blind standards.
Although all
three of the criteria are important, perhaps this is the most significant
because
it
includes
accuracy
of
measurement
as
well
as
precision
(reproducibility): therefore, any systematic errors in the measurement would
appear.
Responsibility for preparing, standardizing, and distributing the.
standard samples was assigned to Dr. Oavid Jennings of Western Oregon State —
College (WOSC).
In this way, the primary responsibility for evaluating the
analytical integrity of the data was vested in a aisinterested party.
5000315