Cobalt-60 with a half-life of 5.27 years is made by exposing a 150 g of cobalt-59 (density 8.9 gm/cm^3), capture cross-section 36 barns, to thermal neutrons at a flux of 10^12 neutrons/cm^2/sec. What length of exposure, in days, would be necessary to attain an activity of 5 curie? Determine the maximum activity of the cobalt-60 under the given conditions. The thermal-neutron absorption cross-section of cobalt-60 may be taken to be 6 barns.