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In conjunction with efforts to predict residual radiation levels in theFermilab Main Injector, measurements of residual radiation were correlated withthe time history of losses. Detailed examination suggested that the list ofradioactive isotopes used for fitting was incomplete. We will report onactivation studies of magnet steel and copper samples which we irradiatedadjacent to the Fermilab Main Injector collimation system. Our resultsidentified several additional radioactive isotopes of interest. The MARS15studies using a simplified model are compared with measurements. The longhalf-life isotopes will grow in importance as operation stretches to a seconddecade and as loss rates rise. These studies allow us to predict limits onthese concerns.

Activation Products from Copper and Steel Samples Exposed to Showers Produced by 8 GeV Protons Lost in the Fermilab Main Injector Collimation System