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ASSESSMENT OF NATURAL RADIOACTIVITY LEVELS AND …
www.nipne.ro2 Assessment of natural radioactivity levels and radiation hazards for building materials 727 inhalation of radioactive inert gases radon (222Rn, a daughter product of 226Ra) and thoron (220Rn, a daughter product of 224Ra), and their short-lived secondary products lead to the internal exposure of the respiratory tract to alpha particles.