Precision /Accuracy IDetermination of^'Pu/(^^^Pu + ^^'Pu) / Alpha spectrometryO.Ol to 10 by a spectrometry and demonstrates the validity of a simple method for the analysis of a spectrum. AbstractThe evaluation of precision and accuracy in "'Pu/("'Pu+""'Pu) a activity ratio determination is of paramount importance for calculating '"Pu in plutonium samples and for exploiting Isotope Dilution Alpha Spectrometry (IDAS) to establish the concentration of plutonium in the irradiated fuel dissolver Solution. This has been achieved by preparing synthetic mixtures with a activity ratios ranging from O.Ol to 10 using '"Pu and '"Pu isotopes. Sources were prepared from these mixtures by electrodeposition in an aqueous HNO3 medium and the a spectra were recorded by employing a solid State sihcon surface barrier detector coupled to a 4 K analyser. The validity of a simple evaluation method based on the geometric progression (G. P.) decrease for the far tail of the spectrum is demonstrated in the present work. It is concluded that an accuracy of 0.5% and a precision of ± 0.2% (1 o) can be reached in the determination of "»Pu / ("' Pu+"° Pu) cx activity ratio ranging from O.Ol to 10.

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