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Question

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=2.50×106g
Specific activity =0.5×3.7×1072.5×106=7.4×1012disg1s1

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