Radiation noise power spectra were measured at frequencies from 20 Hz up to 3 kHz in high-frequency inductively coupled plasma (ICP). Aerosol sample radiation excess noise compared to that of argon radiation at frequencies of about 2 kHz and lower was observed. This excess noise is interpreted as a modulation of the radiation intensity by evaporating aerosol droplets. Further understanding and measurements of the noise spectra can be useful in both sample flow and droplet evaporation rate studies and analysis of possible ways to reduce ICP sample radiation or fluorescence detection limits.
In this work concentrations of minor graphite impurities in virgin graphite of the Ignalina Nuclear Power Plant (Ignalina NPP) measured by high resolution inductively coupled plasma mass spectrometry (ICP-MS) are presented and applicability of the method for the evaluation of minor graphite impurities is discussed. It is shown that ICP-MS is a promising technique for determination of graphite impurities in 10 ppm -10 ppt concentration range as a rapid and relatively cheap method. The most important nuclides for evaluation of short-and long-lived activation products in the Ignalina NPP graphite were measured with the accuracy sufficient for the radioactive waste classification. These results could be used for planning of dismantling and disposal of the Ignalina NPP graphite.
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