CaF 2 (Eu) , Europium doped calcium fluoride is a low density scintillation crystal with a high light output. Thanks to its low Z value it is well suited for the detection of electrons (beta particles) with a high efficiency (low backscatter fraction). CaF 2 (Eu) is a crystal that is also used in phoswich scintillation detectors in combination with NaI(Tl).

Physical Properties:

Density	-	3.18 g/cm3
Emission Max	-	435 nm
Decay Constant	-	0.84 µs
Refractive index	-	1.47
Conversion Effency	-	50
Hydroscopic	-	No