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