Rn, rutenijum, element, siv i krt metal koji se javlja zajedno s platinom, kojoj je sličan.
Rutherford
Raderferd (rd), količina ma kakvog radioaktivnog izotopa koja u svakom sekundu ima 1 milion raspadanja. Rd = 1,0 x 106 dezintegracija u sekundu. 1 kiri ima 37.000 rd. 1 mc = 37 rd.
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