Table 1. Allowable counting errors according to the total activity in the sample received
by the contracting laboratories.
Radionuclide
pCi
239,240p,
lo error (%)
<0.1
50 to 100
<<40
0.1 to 0.25
238,241 5,
241 An
1370,
0.25 to |
<20
>1
<10
<2
50 to 100
2 to 5
<40
5 to 20
<20
> 20
<10
<0.1
0.1 to 0.25
0.25 to |
50 to 100
<40
<20
>]
<10
<I
50 to 100
1 to 5
<30
5 to 8
<20
<1
50 to 100
1 to 5
<30
5 to 8
£20
>8
<10
<10
>8
905.
(3)
The third criterion required 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); any systematic
errors
in
the
measurement
would
appear.
Responsibility
for
preparing,