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