{HEAD ~ Fluorescence emission} of iron or cerium in glass is excited and imaged onto {TAIL ~ segmented detectors} 
is imaged onto
{ HEAD ~ Fluorescence emission } of iron or cerium in glass is excited and imaged onto { TAIL ~ segmented detectors }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL