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Eu:CaF2 Scintillation Crystals

DESCRIPTION

FEATURES

The uoride materials have a wide range of potential optical applications because of their high transparency arising from low-energy phonons and high ionicity. Especially, the calcium fluoride (CaF2) crystal with an optically isotropic uorite structure has attracted much more attention due to its high transparency in a broad wavelength range, high chemical resistance, high laser damage threshold and low refractive index. Rare earth elements are easily to form clusters in CaF2 crystals, which is beneficial for reducing the doping concentration and maintaining the energy transfer between erbium ions as well. As s one of the phosphors that has efficient excitation in the near UV range, Europium-activated calcium fluoride (Eu:CaF2) is an inert and transparent material with several characteristics that make it attractive for use as a scintillator in radiation detection systems. It has an average light yield of 24,000 photons*MeV–1 and the refractive index is similar to that of many photomultiplier tube windows and optical coupling compounds. Therefore, a high light collection efficiency can often be obtained. Additionally, the maximum wavelength of fluorescent emissions from Eu:CaF2 of 435 nm matches well with photocathode photomultiplier tubes. What’s more, Eu:CaF2 can be used in relatively harsh environmental conditions because of its non-hygroscopic nurture and fracture resistance.

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High transparency High chemical resistance High laser damage threshold Low refractive index Non-hygroscopic nurture Excellent fracture resistance Low density Low phonon energy

APPLICATIONS Biomedical imaging Therapeutics Photonics UV sensor Filter Medical treatments Detection of low energy photons 2.8 µm lasers

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Eu:CaF2 Scintillation Crystals PARAMETERS

SPECTRA

MATERIAL PROPERTIES Property

Value

Materials

Eu:CaF2

Density (g/cm3)

3.18

Melting Point (℃)

1360

Hardness (Mohs)

4

Hygroscopicity

No

Cleavage Plane

<111>

Solubility (g/100gH2O)

0.0017

Thermal Expansion (C-1)

19.5*10-6

SCINTILLATOR PROPERTIES Property

Value

Wavelength(Max. emission) (nm)

435

Wavelength range (nm)

395-525

Decay time (ns)

950

Light yield (photons/keV)

30

Refractive index(Max. Emission)

1.47

Radiation length (cm)

3.05

Transmittance (%)

TBA

Optical transmittance (um)

0.13-10

Reflection loss/surface (%)

5.4

Energy resolution (%)

<8

Photoelectron yield [% of NaI(TI)](for γ-rays)

50

Neutron capture cross-section (barns)

TBA

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+86-21-69910952 / 69913696 No.200, Zhaoxian Road, Jiading District, Shanghai, China

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Eu:CaF2—A scintillation material with high optical transparency and low phonon energy  

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