Unirradiated Thorium
Unirradiated Thorium : Thorium containing not more than 10-7 g of uranium-233 per gram of thorium-232. Although the term unirradiated thorium is used, the issue is not really whether the thorium has been irradiated, but rather whether the content of uranium-233 (a fissile material) is significantly higher than the trace levels found in naturally occurring thorium
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