A scintillator, characterized in that it comprises {TAIL ~ crystals} of {HEAD ~ Pr1} xCexF3  
A scintillator , characterized in that it comprises { TAIL ~ crystals } of { HEAD ~ Pr1 } xCexF3
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH