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BaF2 crystal (cerium-doped barium fluoride crystal) is a crystal with the fastest decay time and is widely used in high energy physics experiments, gigahertz hard X ray imaging, and time-of-flight (TOF) positron emission tomography. The fast components of pure BaF2 crystals are concentrated in the peaks of 195nm and 220nm, and the decay time is about 800ps. In addition, there is a slow component with the peak of the emission spectrum near 310nm, and the decay time is about 600ns. The introduction of cerium ions(Ce3+) can effectively suppress slow components and improve the performance of the crystal.

Ce: BaF2 crystal shows high density of 4.83g/cm3 and with a radiation length of about 2.05cm. The refractive index of BaF2 is close to that of optical glass, which makes it easier to export light in coupling with the photomultiplier tube. Ce: BaF2 crystals are widely used in the detection of high-energy particles, such as β-rays and γ-rays.

Features Applications
  • Fastest decay time
  • High density
  • Refractive index matching
  • γ-ray detection
  • Time-of-flight (TOF) positron emission tomography
  • Ionizing radiation detector
  • X-ray imaging
  • Radiation scintillation screen

Material Features

Chemical formulaCe: BaF2
Density (g/cm3)4.893
Melting point (℃)1386
Hardness (Mho)3
Lattice Constant (nm)0.6196
Solubility (g/100gH2O)0.17
Thermal expansion coeff (C-1)18.4*10-6
Thermal conductivity coeff (W/mk)11.72

Scintillator Properties

Wavelength(Max.emission) (nm)310
Wavelength range (nm)170~460
Decay time (ns)630(slow); 0.87/0.88(fast)
Light output (photons/MeV)10000(slow); 1900(fast)
Refractive index1.49@310nm
Radiation length (cm)2.026
Optical transmission (um)0.15-12.5
Transittance (%)>90(0.35-9um)
Reflection loss/surface (%)6.8
Afterglow(after 3ms) (%)0.005
Light output relative to NaI(TI) (%)20(slow); 4(fast)


BaF2&Ce:BaF2 transmission spectrumBaF2&Ce:BaF2 emission spectrum
BaF2&Ce:BaF2 γ energy spectrum

Related application(s) with Ce:BaF2:

γ-ray detection

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