Abstract
A highly sensitive (detection limit 3 ×10-7 g g-1) procedure was developed for determination of Th in samples of soils and environmental objects. The method is based on the reaction 232Th(γ,n)231Th (T1/2 = 25.5 h). The samples were γ-irradiated for 4 h at an average electron current of 15 μA and electron energy Ee = 24.5 MeV. The Th content was estimated by recording X-ray emission of 231Th with Eγ = 25.65 keV. The X-ray spectra of the irradiated samples were recorded on an X-ray spectrometer with an Si(Li) semiconductor detector [30 mm2 area; resolution at the FeKα line (6.4 keV) 200 eV].
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