Europium doped calcium fluoride crystal (Eu: CaF2) is a scintillation crystal with excellent performance. Calcium fluoride (CaF2) matrix has an optically isotropic fluorite structure, has high transparency in a wide wavelength range, high chemical resistance, high laser damage threshold, and low refractive index, and has attracted much attention. At the same time, CaF2 has strong shock resistance, thermal shock resistance, and good mechanical processing performance, and its saturated vapor pressure is low. It can be used not only under normal pressure but also in a vacuum environment. Eu: CaF2 is an inert and transparent material. It is hardly soluble in water and insoluble in most organic substances so that Eu: CaF2 crystals can also be in direct contact with the radiation in the solution state, which is convenient to use. The maximum fluorescence emission wavelength of Eu: CaF2 is 435 nm, and the refractive index is similar to most photomultiplier tube windows and optical coupling agents, which makes Eu: CaFscintillation crystal detectors have high light collection efficiency.

Due to its unique scintillation and physicochemical properties, Eu: CaFscintillation crystal becomes an ideal material for the detection of low-energy gamma rays and charged particles (especially beta rays). It is widely used in low-energy nuclear physics experiments and the detection of charged ions in nuclear reactors, and environmental radiation monitoring and radiological medical diagnosis, and other fields.


Parameter

Material Features

Chemical formulaEu: CaF2
Density (g/cm3)3.18
Melting point (℃)1360
Hardness (Mho)4
HygroscopicNo
Cleavage<111>
Solubility (g/100gH2O)0.0017
Thermal conductivity (W/mK)9.7
Thermal expansion coeff (C-1)19.5*10-6

Scintillator Properties

Wavelength(Max. emission) (nm)435
Wavelength range (nm)395~525
Decay time (ns)950
Light yield (photons/keV)30
Light output relative to Nal(Tl) (%)50
Refractive index1.47@435nm
Radiation length (cm)3.05
Optical transmission (um)0.13-10
Transmittance (%)TBA
Reflection loss/surface (%)5.4
Energy resolution (%)<8
Neutron capture cross-section (barns)TBA
Afterglow (%)<0.3

Spertrum

Feature

  • Good in terms of light emission
  • Good mechanical properties
  • Chemically inert
  • Well suited to use within vacuums as it has a very low vapour pressure
  • High Transparency
  • High Chemical Resistance
  • High Laser Damage Threshold
  • Low Refractive Index
  • No-moisture Absorption
  • Excellent Fracture Resistance
  • Low Density
  • Low Phonon Energy

Application

  • Biomedical Imaging
  • Photonics
  • UV sensor
  • Drug Therapy
  • Detection of Low-energy Photons
  • 2.8µm Laser

Reference

[1]  Lin L Y ,  Leitner D ,  Benatti C , et al. Investigation of ion induced damage in KBr, YAG:Ce, CaF2:Eu and CsI:Tl irradiated by various-energy protons[J]. Journal of Instrumentation, 2015.
[2] Moharil, S, V, et al. Modification of luminescence spectra of CaF2: Eu2+[J]. Luminescence the Journal of Biological & Chemical Luminescence, 2015.
[3]  Peng L ,  Zhang Y ,  Xiao H , et al. Nonlinear luminescence response of CaF2:Eu and YAlO3:Ce to single-ion excitation[J]. Journal of Applied Physics, 2014, 115(3):1.

Leave a Reply

Your email address will not be published. Required fields are marked *