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