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Ãðåé (Ãð) äîð³âíþº äîç³ âèïðîì³íþâàííÿ, ïðè ÿê³é îïðîì³íåí³é ðå÷îâèí³ ìàñîþ â 1 êã ïåðåäàºòüñÿ åíåðã³ÿ ³îí³çóþ÷îãî âèïðîì³íþâàííÿ 1 äæîóëü.
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