Said invention provides self luminosity by {TAIL ~ means} of a plurality of glass microspheres containing both a light emitting phosphor and {HEAD ~ a radioactive gas} 
Said invention provides self luminosity by { TAIL ~ means } of a plurality of glass microspheres containing both a light emitting phosphor and { HEAD ~ a radioactive gas }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD