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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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238 Pu / Alpha spectrometry / Thermal ionization mass spectrometry / NIST-SRM-947 / Isotopic reference material Summary. A comparative evaluation of 238 Pu determination in NIST-SRM-947-Pu isotopic reference material by alpha spectrometry and thermal ionization mass spectrometry (TIMS) is presented. Electrodeposited sources with geometric progression (G.P.) method to account for tail contribution were used in alpha spectrometry. In TIMS, the recently developed approach of using 235 U as a monitor isotope in interfering element correction methodology was employed to account for the isobaric interference of 238 U at 238 Pu. The atom % abundance of 238 Pu determined by both the methods is in good agreement with each other but is higher than that quoted by NIST in the reference material SRM-947-Pu.