Europium-doped calcium fluoride (CaF2(Eu)) crystal is a scintillation detection material capable of detecting low-energy gamma rays (hundreds of keV) and charged particles. While its relatively low effective atomic number limits its application in high-energy gamma-ray spectrometers, this property reduces backscattering of radiation and particles, making it an ideal material for beta particle detection. The refractive index of CaF₂(Eu) crystal is 1.47, closely matching that of most photomultiplier tube (PMT) windows and optical coupling components, thereby achieving high light collection efficiency. The crystal exhibits an emission wavelength peak at 435 nm, which aligns well with the sensitive range of bialkali photomultiplier tubes.
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Huilei Optical Electric Technology