Abstract
Instrumental neutron activation analysis with internal standard correction was applied for precise determine of mg quantities of Ir in high-purity IrBr4. A known amount of Au standard solution was used as an internal standard to compensate for inhomogeneity of the neutron flux through an irradiation capsule and for neutron self-shielding. The linearity of the calibration curves of Ir was improved by using an internal standard. The relative expanded uncertainty (k = 2) associated with the determined value was 0.86%, which allowed the mg quantities of iridium to be precisely determined.
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