  Effects of proton beams irradiating materials considered for targets in
high-power accelerator experiments have been under study using the Brookhaven
National Laboratory's (BNL) 200 MeV Linac. The primary objectives of the study
that includes a wide array of materials and alloys ranging between low and
high-Z are to (a) observe changes in physio-mechanical properties which are
important in maintaining high-power target functionality, (b) identify possible
limits of proton flux or fluence above which certain material seize to maintain
integrity, (c) study the role of material operating temperature in inducing or
maintaining radiation damage reversal, and (d) correlate radiation damage
effects of different species such as energetic protons and neutrons on
materials by utilizing reactor and particle accelerator experience data. These
objectives are specifically being addressed in the latest material irradiation
study linked to the Long Baseline Neutrino Experiment (LBNE). Observations on
irradiation effects on materials considered for high-power targets and other
beam intercepting elements, such as collimators, from past studies and
preliminary observations of the ongoing LBNE study are presented in this paper.
