The radiation shield is adapted to be interposed between a reaction zone and a means for condensing an alkali metal vapor in {TAIL ~ a thermoelectric generator} for converting {HEAD ~ heat energy} directly to electrical energy 
The radiation shield is adapted to be interposed between a reaction zone and a means for condensing an alkali metal vapor in { TAIL ~ a thermoelectric generator } for converting { HEAD ~ heat energy } directly to electrical energy
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH