BaF2 Bariumfluoride Scintillation Crystal Description:
Barium fluoride is a salt compound of barium and fluorine. In its crystalline form, it is optically transparent across a wide range from the ultraviolet (UV) to the infrared (IR). It is used in the manufacture of optical components. BaF2 scintillation crystals exhibit a decay time of 800 ps at 220 nm. The emission at 220 nm has a sub‑nanosecond decay time, which is measured in time-of-flight experiments.

BaF2 Bariumfluoride Scintillation Crystal Features:
- Sub‑nanosecond decay time
- Two emission wavelengths (310 nm and 295 nm)
- Slightly hygroscopic; prolonged exposure to moisture affects the surface quality
- Highly sensitive to thermal shocks, which may cause fractures
BaF2 Bariumfluoride Scintillation Crystal Specifications:
Density (g/cm³)
|
4.88
|
Melting Point (K)
|
1627
|
Thermal Expansion Coefficient (°C⁻¹)
|
18.4 x 10⁻6
|
Cleavage Plane
|
<111>
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Hardness (Mohs)
|
3
|
Hygroscopicity
|
Slight
|
Peak Emission Wavelength (nm)
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310 / 220 (195)
|
Lower Wavelength Cutoff (nm)
|
135
|
Refractive Index at Peak Emission
|
1.50 (310 nm) / 1.54 (220 nm)
|
Primary Decay Time (ns)
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630 (slow) / 0.6–0.8 (fast)
|
Light Yield (photons/keV)
|
10 (slow) / 1.8 (fast)
|
Photoelectron Yield (% of NaI(Tl)) (for γ‑rays)
|
16 (slow) / 3 (fast)
|
BaF2 Bariumfluoride Scintillation Crystal Applications:
- Studies on positron lifetime
- Time‑of‑flight measurements
- Positron Emission Tomography (PET)
- Certain applications in high‑energy physics