钆-钡/天然皮革复合可穿戴X射线屏蔽材料的制备及性能OA北大核心CSTPCD

To enhance the shielding performance of materials without significantly increasing the thickness,barium(Ba)was initially incorporated into the hierarchical structure of natural leather(NL)through the equal volume impregnation strategy(Ba/NL),and the waterborne polyurethane finishing agent with well-dispersed nano-gadolinium-oxide(Gd2O3)was uniformly coated on the grain surface of Ba/NL to fabricate X-ray shielding material(Gd-Ba/NL).X-ray shielding performance results showed that the 1.5-mm-thick Gd1.80-Ba2.32/NL could provide an equivalent level of shielding efficiency to 2.6-mm-thick Ba2.32/NL.The synergistic effect of Gd and Ba contributed to a shielding efficiency exceeding 70％for the X-rays in the energy range of 16-48 keV,and provided a comparable mass attenuation coefficient for the X-rays in the energy of 65 and 83 keV to that of 0.25 mm lead plate.Furthermore,Gd1.80-Ba2.32/NL exhibited several advantages,including superior wearable comfortableness and excellent mechanical strength.Notably,it possessed a density that is only 1/3 of lead apron,while offering a water vapor permeability 12 times higher than that of lead apron.Its tensile strength and tearing strength surpassed national standards by 2 and 3 folds,respectively.Consequently,Gd1.80-Ba2.32/NL holds great potential as a wearable X-ray shielding material capable of replacing traditional lead apron.