3.5 curies of 18-F can are formed in a 2 hour irradiation of 18-O using 19MeV protons with 35 A beam current. Explain the half-life of 18-F is 16 minutes. It takes 132 minutes to label deoxyglucose to make the PET scanning reagent Fludeoxyglucose. Explain how many curies of radioactivity remain in the product?