Impurities that are limited in UO2 fall under different categories, B, Gd etc being neutron absorbers, F, Cl etc being corrosives, excess oxygen being detrimental to thermal conductivity. Why is Lithium restricted in some powders? Is it a neutron absorber? Or. what could be the other reasons? What is the origin of lithium? Is it present in the ore from which uranium is extracted?

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