반사재 in Korean
반ː사―재(反射材)[명사]원자로의 노심(爐心)에서 발생한 중성자가 밖으로 새는 것을 막기 위하여, 노심을 둘러싸는 반사체로 쓰는 물질. [흑연·베릴륨·중수(重水) 따위.]
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