from 233 uranium compounds and ascribed to an ultraviolet gamma-ray emission from the metastable 229 thorium daughter is actually N 2 discharge emission induced in the air surrounding the sample by the sample radioactivity. The UV spectrum from high elemental and isotopic purity 233 UO 3 reported here also exhibits a line at 391.3 nm that does not appear to be due to electric discharge N 2 emission. [S0031-9007(99)
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