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$Au ^{198}$ નો અર્ધ- આયુ $2.7$ દિવસ છે. જે પરમાણુ દળ $198\, g mol ^{-1}$ હોય તો $1.50 \,mg$ $Au ^{198}$ સક્રિયતા (activity) ......$Ci$ છે. $\left( N _{ A }=6 \times 10^{23}\, / mol \right)$