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?

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?