Abstract
Two novel low-activation materials for a fusion reactor first wall and blanket structures are examined: a vanadium-based alloy (V–4Cr–4Ti) and a SiC/SiC composite. The comparison concerns low-activation properties, and stresses the importance of data on the impurity content. In particular, new data about impurity levels in vanadium alloys show that long-term activation of such materials may be strongly reduced if certain impurities are kept under control.
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