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BaF2 Crystal

Barium fluoride (BaF2 ) crystal has been commonly used as a laser window material due to its broad transmission spectrum (190-1200nm). It is characterized by high transmittance, slight hygroscopicity and little dependence of refractive index on the temperature. The emission of BaF2 consists of a fast component with =0.6ns at 180-240nm and a slow one with 620ns at 310nm. Its luminescence intensity is independent on temperature. It is regarded as the fastest scintillators so far. Since the fast component can be used to measure time precisely, and obtain good time resolution, it has been pursued as a promising scintillator in the research of positron annihilation. It shows excellent radiation hardness up to 106 rad or even more. All these properties make barium fluoride crystals favorable for the applications of nuclear detection involving very high counting rates and severe radiation.

Scintillation properties of BaF2 crystal:

 

Densityg.cm-3
4.88
Radiation length(cm)
2.03
Decay constant(us)
0.8ns/630ns
Emission peak(nm)
220/310
Light yield(%NaI:Tl)
8/32
Melting point(°C)
1280
Hardness(Mho)
3
refractive Index
1.56
Hygroscopicity
slightly
Cleavage
(111)

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