A still further advantage of my invention is that the radioactive gas completely surrounds the phosphor particles, thus causing light emission from {HEAD ~ 100 percent} of {TAIL ~ the surface} of said particles 
of
A still further advantage of my invention is that the radioactive gas completely surrounds the phosphor particles , thus causing light emission from { HEAD ~ 100 percent } of { TAIL ~ the surface } of said particles
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH