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Eu:SrI2 crystal is an excellent scintillation crystal with relatively large effective atomic number, high light output, very high energy resolution, and relatively low afterglow time. It is very suitable for application in nuclear isotope identifiers and security inspection, and potential for industrial and medical computer tomography, high resolution X-ray imaging. The emission peak of Eu:SrI2 crystal is about 435 nm. Which matches well with the photomultiplier tube (PMT) and silicon photodiode (PD).

Features Applications
  • Good Energy Resolution
  • High Thermal Conductivity
  • High Mechanical Strength
  • Fast Decay Time
  • High Light output
  • Hand-held high-precision nuclide identification instrument
  • Portable gamma spectrometer
  • Online measurement of radioactive waste water
  • Element isotope screening
  • Industrial and medical X-ray tomography
  • Ultra-high resolution X-ray imaging
  • Neutron detection

Material Features

Chemical formulaEu:SrI2
Density (g/cm3)4.55
Melting point (℃)538
Atomic number (effective)49
Thermal expansion coeff (C-1)21.64*10-6

Scintillator Properties

Wavelength (Max. emission) (nm)435
Wavelength range (nm)400-480
Decay time (ns)1200
Light yield (photons/kev)80
Light output (photons/MeV)80000
Rafractive index 1.85
Radiation length (cm)1.95
Energy resolution (%)<3
X-ray Absorption 100 KeV (cm-1)2.88
X-ray Absorption 662 KeV (cm-1)0.13


Eu:SrI2 energy spectrumEu:SrI2 emission spectrum
Eu:SrI2 decay curve

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