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Automated gravimetric sample pretreatment using an industrial robot for high-precision determination of plutonium by isotope dilution mass spectrometry

Surugaya, Naoki ; Hiyama, Toshiaki; Watahiki, Masaru

A robotized sample preparation method for the determination of Pu, which is recovered by extraction reprocessing of spent nuclear fuel, by isotope dilution mass spectrometry is described. The automated system has a six-axis industrial robot, whose motility is very fast, accurate and flexible, installed in a glove box. The automation of the weighing and diluting steps enables operator-unattended sample pretreatment for highly precise analyses of Pu in aqueous solutions. By the developed system, Pu concentration in HNO$$_{3}$$ medium was successfully determined with a set of subsequent mass spectrometric measurements. The relative uncertainty in determining the concentration of Pu by isotope dilution mass spectrometry using this system for sample pretreatment was estimated to be less than 0.1 rel.% ($$k$$=2), which is equal to that expected of a talented analyst. The operation time required was the same as that by a skilled operator.

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Category:Chemistry, Analytical

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