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