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