A sample of 9038Sr has an activity of 0.5mCi. What is its specific activity? (t1/2 of 9038Sr=19.9 years)
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Solution
Rate of disintegrations =λ× Number of atoms So, Number of atoms =0.5×3.7×1070.693×19.9×365×24×60×60=1.675×1016 Mass =90×1.675×10166.023×1023=2.50×10−6g Specific activity =0.5×3.7×1072.5×10−6=7.4×1012disg−1s−1