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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 57, Iss. 9 — Sep. 1, 2003
  • pp: 1167–1172

Isotopic Measurements of Uranium Using Inductively Coupled Plasma Cavity Ringdown Spectroscopy

Chuji Wang, Fabio J. Mazzotti, George P. Miller, and Christopher B. Winstead

Applied Spectroscopy, Vol. 57, Issue 9, pp. 1167-1172 (2003)


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Abstract

Inductively coupled plasma cavity ringdown spectroscopy (ICP-CRDS) is applied to isotopic measurements of uranium. We have successfully obtained the isotopic-resolved spectra of uranium at three different atomic/ionic transition lines, 286.57, 358.49, and 409.01 nm. Of the three lines, the largest isotope shift of approximately 9 pm was measured at the 286.57 ionic line. Isotopic-resolved spectra were recorded in ratio of 1:1 (235U/238U, 2.5 μg/mL) and at the natural abundance ratio of 0.714% (235U/238U, 1.25 μg/mL 235U). The smallest measurable isotope shift of approximately 3 pm was determined for the 409.01 nm ion spectral line. Detection limits (DL) were obtained under optimized ICP operating conditions to be in the range of 70~150 ng/mL, except for the 238U component of the 286.57 nm line (300 ng/mL). This latter result was determined to be due to a strong, previously unreported, absorption interference from the argon plasma. The 235U isotope component (DL 70 ng/mL) was found to be unaffected. This work demonstrates the applicability of ICP-CRDS for uranium isotopic measurements. The potential of development of a field-deployable, on-line uranium isotope monitor using plasma-CRDS is discussed.

Citation
Chuji Wang, Fabio J. Mazzotti, George P. Miller, and Christopher B. Winstead, "Isotopic Measurements of Uranium Using Inductively Coupled Plasma Cavity Ringdown Spectroscopy," Appl. Spectrosc. 57, 1167-1172 (2003)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-57-9-1167


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