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Actinoids (synonym: actinides) – family of relatives on chemical properties of fifteen elements of the seventh period of periodic system of D. I. Mendeleyev which all isotopes are radioactive. The actinoids (thorium, uranium, plutonium) applied in the industry are extremely slowly removed from an organism as have high toxicity. At the treatment of them it is necessary to observe measures of antiactinic protection strictly.

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During sneezing our organism completely stops working. Even heart stops.