May 2022 0 51 Report

В нескольких килограммах руды содержится 108 ядер Радия -226. Определите
активность Радия в руде на данный момент времени, если спостоянная распада ядер
атомов радиоактивного Радия-226 равна 1,37:10" c-1.
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