In addition there is a REECo internal quality control procedure.
For
instance, the analytical balance in the soil preparation area has a quality
contro! program going on it.
There will be resampling of a large batch of
soil recent ly taken at Hurricane and both plutonium and gamma analysis samples will be sent through on a periodic basis.
Given that the plutonium
analysis: can handle eight per week, eight samples per week, one of those
will
be an external
=
a
quality control
sample,
and one of them will be an
internal quality‘control sample.
We have’‘designed an experiment to address a problem in precision of
10
analysis in the REECo laboratory.
1l
analysis of a randont=components design and should allow us to determine at
12
what part
13
creeping in.
14
many people care
15
crowd, this is what R. L. Anderson calls a staggered experimental design.
16
We will take eight 200-gram al iquotsfour of this kind, two of this kind,
17
one of each of those kinds.
18
the sample.
19
two analyses here will give us an est imateofthe variability due to the
20
plating step.
21
estimate.
22
and this will give us, directly, an aliquoting estimate, or have 1 skipped
23
one, leaching.
24
degrees
25
Type 2, Type 3 and Type 4, and what we have at the end of the experiment is
26
‘an almost equal number of degrees of freedom for estimating each of the
in the REECo plutonium analysis procedure,
variance
28
design
the uncertainty is
Perhaps F-coutd stick this up here (FM-4), probably not too
too much
about-this,
but
for
the
statisticians
in
the
Everytime there is a fork in there we split
You notice that we split one of the samples 16 times and the
The split here will give us -acolumn-extraction variability
The split here will give us a scavenging-variability estimate,
I have laid out here, given that this—is Type 1, where the
of freedom with respect
27
The experiment, essentially, is a basic
components.
An
to the exper imentatdesign
additional
nice
property of
this
go
and
for
experimental
is that the estimates of variance components are not correlated,
175