After the initial cleanup of Three-Mile Island following the accident, approximately 400,000 gallons of radioactive water remained in the basement of the unit 2 containment building. The principle sources of this radioactivity were 137Cs (half-life of 30.2 yr) at 156 Ci/cm3 and 134Cs (half-life of 2.06 yr) at 26 Ci/cm3. How many atoms per cm3 of each of these radionuclides were in the water at that time?