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Low toxicity alpha emitters are: natural uranium; depleted uranium; natural thorium; uranium-235 or uranium-238; thorium-232; thorium-228 and thorium-230 when contained in ores or physical and chemical concentrates; or alpha emitters with a half-life of less than 10 days.
Por emisores alfa de baja toxicidad se entenderá: uranio natural; uranio empobrecido; torio natural; uranio 235 o uranio 238, torio 232, torio 228 y torio 230, contenidos en minerales o en concentrados físicos o químicos; o emisores alfa con un período de semidesintegración de menos de 10 días.
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