Abstract
The aim of this work was the preparation of samples with thorium on the steel discs by electrodeposition for determination of natural thorium by alpha spectrometry and for following analysis by secondary ion mass spectrometry. The samples with 232Th isotope were prepared by electrodeposition from solution Th(NO3)4·12H2O on steel discs in electrodeposition cell with use of solutions of Na2SO4, NaHSO4, KOH and ammonia oxalate by electric current of 0.75 A. Weights of electrodeposited thorium samples were calculated on the basis of intensities of peak of 232Th isotope in the alpha spectra. The layer thickness was calculated for following analysis of surface layers of thorium using secondary ion mass spectrometry.
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