While {HEAD ~ metallic sodium} is usually employed as sodium, {TAIL ~ sodium alloys} containing a small amount of other alkali metals or alkaline earth metals may be used so long as their melting points are lower than about 105° C 
While { HEAD ~ metallic sodium } is usually employed as sodium , { TAIL ~ sodium alloys } containing a small amount of other alkali metals or alkaline earth metals may be used so long as their melting points are lower than about 105 ° C
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