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uranium containing the mixture of isotopes occurring in nature; uranium whose content in uranium 235 is less than the normal; thorium; any of the foregoing in the form of metal, alloy, chemical compound or concentrate;
source material . Haridussõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//har/source%20material/1/eng (02.07.2026)
