For this, electron radiation of {HEAD ~ 3 megavolts} is aimed at {TAIL ~ the surface} of the bellows simultaneously from three different sides for more uniform exposure 
For this , electron radiation of { HEAD ~ 3 megavolts } is aimed at { TAIL ~ the surface } of the bellows simultaneously from three different sides for more uniform exposure
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH