Pertain to a 450 Gram Sample of ⁶⁰Co Recovered from a Decommissioned

pertain to a 450 gram sample of ⁶⁰Co recovered from a decommissioned nuclear reactor. An activity of 1.11´10¹³ Bq was measured by technicians dismantling the plant.

-Refer to Exhibit 19-2. The activity of the sample was measured a year later and found to be 9.73´10¹² Bq. What is the decay constant?

A) 0.132 d^-1
B) 0.0572 d^-1
C) 3.12 d^-1
D) 0.319 d^-1