This is in informal reporf intended primarjly for internal or limited c-xirnuJ distribution. The opinions and conclusions stated are those of the author and may or may not be those of ibe Laboratory-Work performed under the auspices of the 115. Department of Energy by Itit Lawrence Mvenaore National Laboratory under Contract W-7405-Eng-46. tmmmi SF ms w.m JS KLCTS

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The activation of five structural materials and seven coolant/breeder/multiplier materials in a common reference neutron environment was calculated with the FORIG activation code. The reference environment was the neutron flux and spectrum at the first wall of the mirror advanced reactor study (MARS) reactor. Qualitative comparison of these activated materials were made with respect to worker protection requirements for gamma radiation in handling the materials and with respect to their classifications for near-surface disposal of radioactive waste.

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