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Age-dating of single plutonium oxide particles ∼ 1 µm in diameter was demonstrated using eight particles. For this demonstration, the particles were prepared from a standard reference material SRM-947 that had been stored for 3.9 years since the last Pu purification. The Pu particles were separately dissolved, and Am and Pu were chemically separated from the solution  via  anion-exchange chromatography. The isotope ratios of Am and Pu in the eluted fractions were measured using a high-resolution inductively coupled plasma mass spectrometer (HR-ICP-MS). The precision and accuracy of the Pu age were improved through the addition of an  243 Am spike to the sample solutions and by the trace chemical separation of Pu and Am. The determined age in this work was in good agreement with the expected age with high accuracy (deviation: 7.1–105 days) and precision (uncertainty: 0.16–0.5 years ( k  = 1)). These results indicate that a combination of ICP-MS and chemical separation after spiking with  243 Am provides an effective tool for the analysis of environmental samples collected during nuclear safeguard inspections.

Precise age determination of a single plutonium particle using inductively coupled plasma mass spectrometer