I-131(T= 8.05days) is a product of Uranium-235. If the fission yield is 0.50%: 1. Determine the mass of Uranium-235 that needs to be used so as to obtain 7.4 ×10^10 Bq of I-131 after 2 days of irradiation.
2. What will be the radioactivity of the radionuclide 2 days after irradiation? Take effective area of the fission of Uranium-235 to be 577 barns and the available neutron flux to be 10^12 n/cm^2/s