A thermal neutron beam of intensity 1 to the power 11, neutrons/sec is directed for 2 days into a cavity in a block of cobalt initially composed entirely of the stable isotope Cobalt 59. The neutrons are all captured, producing cobalt 60 nuclei which are radioactive with a half-life of 5.3 years.
What is the activity of the cobalt 60
(y-ray) source produced at the end of the two days?