Abstract
244Pu is commonly recognized as the most suitable spike for low-level mass-spectrometric plutonium analysis. However the currently available tracers based on 244Pu are very few and lack isotopic purity. Two-stage electromagnetic separation of plutonium isotopes was performed from a 0.5 g portion of PuO2 material containing plutonium with ~17.5 % 244Pu. The first round of separation yielded approximately 10 mg Pu with ~98.9 % 244Pu. The second round was verified to have produced 0.88 mg Pu with over 99.98 % 244Pu. The final separation product will be certified as a spike for isotope dilution mass spectrometry, to meet the needs of international safeguards for decades to come.
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