Радиоактивность внутри нас: калий 40
Гервидс Валериан Иванович - доцент кафедры общей физики МИФИ, кандидат физико-математических наук.
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![☢ Село Ширяевка. Радиация есть и есть интерес. [Сергей Белкин].](https://sun9-31.userapi.com/vvNpjQhC3vag8jH85-P_Zjh3Ty2TQ8dmTnQ1kA/5FYyxuHlAM8.jpg)
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