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- 저자 : Maha M. AlShammari (검색결과 1 건)
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Effect of rare earth dopants on the radiation shielding properties of barium tellurite glasses
P. Vani,G. Vinitha,M.I. Sayyed,Maha M. AlShammari,N. Manikandan 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
Rare earth doped barium tellurite glasses were synthesised and explored for their radiation shieldingapplications. All the samples showed good thermal stability with values varying between 101 C and135 C based on dopants. Structural properties showed the dominance of matrix elements compared torare earth dopants in forming the bridging and non-bridging atoms in the network. Bandgap valuesvaried between 3.30 and 4.05 eV which was found to be monotonic with respective rare earth dopantsindicating their modification effect in the network. Various radiation shielding parameters like linearattenuation coefficient, mean free path and half value layer were calculated and each showed the effectof doping. For all samples, LAC values decreased with increase in energy and is attributed to photoelectricmechanism. Thulium doped glasses showed the highest value of 1.18 cm1 at 0.245 MeV for 2 mol.%doping, which decreased in the order of erbium, holmium and the base barium tellurite glass, while halfvalue layer and mean free paths showed an opposite trend with least value for 2 mol.% thulium indicating that thulium doped samples are better attenuators compared to undoped and other rare earthdoped samples. Studies indicate an increased level of thulium doping in barium tellurite glasses can leadto efficient shielding materials for high energy radiation.
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