The containment of the self luminous system within {HEAD ~ an envelope} which does not pass {TAIL ~ any radiation} prevents the deterioration of nearby organic materials 
The containment of the self luminous system within { HEAD ~ an envelope } which does not pass { TAIL ~ any radiation } prevents the deterioration of nearby organic materials
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH