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