Stable-isotope dilution activation analysis for special samples in which the self-sheilding effect is negligible

Abstract

A method has been developed where the element to be determined in the sample consists of at least two stable isotopes, which are easily converted to radionuclides through particular nuclear reactions. The sample is previously processed by adding a known quantity of an enriched isotope of the element, while the comparative reference is prepared by taking an arbitrary amount of the natural element under investigation. The usefulness of the method was verified by photon activation analysis of strontium in standard reference materials of tomato and citrus leaves, using isotopically enriched⁸⁶Sr as a spike, and the accurary and precision of the method were proved to be valid.