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Uranyl ion fluorescence at 520 nm has been recorded from solutions that were excited only by radioactive emanations from trace concentrations of a 232U impurity or added 225actinium nitrate. This fluorescence had also been observed by others from 233UO4·2H2O, but was attributed to a nuclear origin. Atomic oxygen emission was observed for a 233UO4·2H2O sample, as was a broad visible emission originating from the fused silica tube that contained the radioactive sample.
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Young et al. (1999) studied this question.
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