A 30-g sample of 5"Co is positioned in the core of a reactor with an average neutron flux of 1014 neutrons/cm2 sec. The absorption cross section of 59Co is 36 barns. The half-life of 60Co .is 5.3 years a- What is the activity of the sample ?after 7.0 years b- What is the maximum activity for ?the sample c- When does the sample activity ?reach 80% of its maximum activity

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