Lithium Fluoride Tile and Sheet for Neutron Shield By Keiji KANDA As shielding materials for thermal neutrons, LiF tile and LiF sheet have been manufactured, which produce little secondary γ-rays by neutron captures. Lithium fluoride tiles in ceramics are made by sintering. The standard sizes are of 50×50×10 and 100×100×10mm3 for natural Li, and of 25×25×2 and 50×50×2mm3 for enriched Li. The density of the tiles is more than 95% of the theoretical density for preventing tritium release due to

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... i(n,α)8T reactions. Flexible LiF sheets using enriched LiF powder are made by the hot press method, of which standard sizes are 30×30×0.5 and 60×90×0.5cm3. The neutron shielding effects of both the materials were measured by the use of the KUR heavy water facility. The LiF tile has already been used for a shielding material and also for a mock material of FLiBe at several research institutes in Japan.