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Deuterium retention during 10eV and 500eV/D + irradiations at 300 and 500K was compared for 99.96% pure polycrystalline tungsten (PCW) foils and similar PCW foils contaminated with carbon and oxygen impurities. The contaminated foils showed reduced deuterium retention at 500K compared with pure foil specimens while there was no difference for 300K irradiations. X-ray photoelectron spectroscopy...