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The isotope Cs-137 is a standard source of Gamma rays, The half-life of Cs-137 is 30 years, what is the activity of the source 10

The isotope Cs-137 is a standard source of Gamma rays, The half-life of Cs-137 is 30 years, what is the activity of the source 10 years later if the current activity is 5 micro Ci?

solve using the activity equation

A = Ao e-t

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