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Natural Alteration of 6Li Neutron Shielding Glass



Jamie L. Weaver, Danyal J. Turkoglu


Li-6 alumino-silicate glass, a neutron shielding material, has been studied to determine if and to what extent it alters under natural conditions. Analyses included neutron depth profiling, prompt gamma activation analysis, x-ray diffraction, and scanning electron microscopy. Results indicate that the glass does undergo alteration, which results in Li-6 depletion within the first 10's of um of the glass's surface. Subsequent studies suggest that alteration is relatively quick, with the first 20 um of the surface altering after only 2 months of exposure to a natural environment. Although the extent of alteration is relatively small compared to the overall thickness of the shielding glass, thus not significantly effecting its shielding properties, the incorporation of H into the alteration layer may influence low H measurements by instruments lined with this glass.
Physics and Chemistry of Glasses


Neutron Depth Profiling, Prompt Gamma Activation Analysis, glass, durability, neutrons
Created September 21, 2018, Updated November 13, 2018