논문초록
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X-ray radiation is an important factor in industry, medical, military, and space fields. For X-ray shielding, lead (Pb) is the most commonly used in every area but it is heavy and has harmful effects on human health and the environment. To replace the Pb, we developed herein gadolinium (Gd)-based metal-organic framework (MOF) based bismuth halide composites for x-ray shielding. The resultants showed excellent shielding ability and mechanical flexibility. The key role of Gd-MOF is the formation of chemical bonding with bismuth halides, thereby absorbing more bismuth halide in sponge and improving x-ray shielding performances. The maximum amount of Gd-MOF contain sponge absorbed 1.34g bismuth halide and showed excellent shielding performance, approximately 94% at 60 kV and 78% at 100 kV, one of the highest efficiencies for non-heavy-metal shielding materials (density = 1.21g/cm3). |