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