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WK76 Practice for Alternate Actinide Calibration for Inductively Coupled Plasma-Mass Spectrometry

Date Initiated: 02-07-2003
Date Deletion Requested: 06-26-2006

1. Scope

1.1 This standard practice provides guidance for an alternate linear calibration for the determination of selected actinide isotopes in appropriately prepared aqueous solutions by
Inductively Coupled Plasma-Mass Spectrometry. This alternate calibration is mass bias adjusted
using natural isotopic abundance Thorium and natural or known isotopic abundance Uranium
standards.
1.2 The instrument response for a series of determinations of known concentration of 232Th and 238U defines the mass/response relationship. For each standard concentration, the slope of the line defined by 232Th and 238U is used to derive linear calibration curves for each mass of interest using īnovelŠ interference equations. The mass bias corrected calibration curves, although generated from constant interference equations, are specific to the instrument operating parameters and tuning in effect at the time of data acquisition.
1.3 For this standard practice, the actinide atomic mass range that has been studied is from amu 232 244. Guidance for an extended range of amu 228 248 is given in this practice.
1.4 Using this Standard Practice, analyte concentrations are reported at each amu and not by
element total (i.e. 239Pu vs. Pu).
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.