Residual Radiation Studies

Studies of residual radiation levels to be encountered in high beam intensity accelerators are reported. Calculated residual radiation decay curves are compared with experimental data. Previously reported work with 600-MeV protons is extended to a wider range of bombardment times. The experimental and calculated decay curves for C, Al, Fe, and Cu are compared by normalizing the intensities of the 22Na activity in the aluminum. The experimental and calculated decay curves agree within a factor of 2 or 3 over a range of cooling times for bombardment times that range from 3 hrs to 2 years. Data obtained from one group of samples exposed to 19 - 26 GeV protons for 5 months are also compared with the calculated decay curves.