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Photon energy emission from spallation products produced by 3-13 GeV electrons.

A calculation of the energy emitted as photons from the ensemble of spallation products produced by a 3-13.3 GeV electron beam has been made. The time range of 1 hr-50 months after irradiation is encompassed using measured production cross sections for Al, Fe, Ni and Cu, inajor structural materials used around high energy particle accelerators. Similar calculations have been made for Mo, In, Ta and Pb by estimating production cross sections for some ofthe nuclides for which measured production cross sections were not available. Additional production cross sections measured for 3, 5 and 10 GeV electrons and comparisons with published 3--30 GeV proton spallation data are used to show the general applicability of the calculated decay curves. Graphs of the instantaneous irradiation case are included as well as some illustrative results for photon energy emitted following extended irradiation periods.