Low-Background Method of Isotope Markers for Measuring the Efficiency of Intercalation of Graphite by Potassium Atoms
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The result of low-background measurements of the gamma activity of graphite-potassium intercalated sample is presented. A germanium gamma spectrometer, used for measurements, was located in the low-background chamber of Baksan Neutrino Observatory. For 384 hours of exposure, 768 decays of K-40 isotope nuclei were registered. This activity corresponds to 85 μg/cm2 potassium atoms embedded in to graphite lattice. A computer simulation of the intercalation process and the gamma-ray spectrum set is also presented. The accuracy of the potassium concentration determination can be brought to 10–11–10–12 g/g for mixture enriched with K-40 isotope.
The work was supported partially by grants: RFBR no. 16-29-13011 ofi_m, RFBR no. 18-02-01042 a and Foundation for Assistance to Small Innovative Enterprises no. 0038507 UMNIK 17-12 (a).
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