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