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A sample containing 127 g of 2³ Na (100% abundant) is exposed
to a beam of thermal neutrons at a constant fluence rate of
1.19 x 10* cm-2s=1. The thermal-neutron capture cross section
for the reaction 23 Na(n, y)²ªNa is 0.53 barn.
(a) Calculate the saturation activity.
(b) Calculate the 24 Na activity in the sample 24 h after it is
placed in the beam.
(c) How many 23 Na atoms are consumed in the first 24 h?

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