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Transcribed Image Text:59
A 30-g sample of "Co is positioned in
the core of a reactor with an average
neutron flux of 1014 neutrons/cm2
sec. The absorption cross section of
5°Co 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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