Authors: Wang, Chuji; Mazzotti, Fabio J.; Miller, George P.; Winstead, Christopher B.

Source: Applied Spectroscopy, Volume 57, Issue 9, Pages 259A-279A and 1053-1199 (September 2003) , pp. 1167-1172(6)

Publisher: Society for Applied Spectroscopy

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.

Keywords: CAVITY RINGDOWN SPECTROSCOPY; INDUCTIVELY COUPLED PLASMA; URANIUM; ISOTOPES

Document Type: Research article

DOI: http://dx.doi.org/10.1366/00037020360696044

Publication date: 2003-09-01

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