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You are here: Home / Iodide Crystal / Eu:SrI2

Eu:SrI2

Europium doped Strontium Iodide scintillation crystals are high resolution, low background crystals due to their extreme good proportionality and very high light output. The scintillator is relatively slow with a decay time of several microseconds. They are considered prospective materials for spectro-surveymeter systems because of their high light output (over 80,000 photons/MeV) and an energy resolution value of ~3% at 662 keV1–6.

SrI2 (SrI2:Eu): Strontium Iodide scintillators enable high resolution gamma-ray spectroscopy because of the high light output and exceptional linearity of the material. 

With the application of nuclear safety inspection technology in anti-terrorism and the continuous development of nuclear medical imaging, the requirements for light output and energy resolution of scintillation crystals are continuously improved. Security applications and nuclear non-proliferation depend on the rapid identification of highly enriched uranium, radioactive sources and other special nuclear materials. Halide crystals have been widely used as high-energy physics, nuclear medicine, safety inspection and address exploration as radiation materials since their invention in 1948. Eu:SrI2 is expected to become a new generation of gamma scintillator due to its high light output, good energy resolution and high effective atomic number.

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Parameter

Material and Specifications
Chemical formulaEu: SrI2
Molar mass341.43 g/mol (anhydrous) 
AppearanceColorless to white crystalline plates
Crystal structureOrthorhombic, oP24
Space groupPbca, No. 61
Physical and Chemical Properties
Atomic Number (Effective)49
Density (g/cm3)4.55
Melting point (℃)538
Boiling point1,773 °C 
HygroscopicYes
Atomic number (effective)49
Thermal expansion coeff (C-1)21.64*10-6
Magnetic susceptibility (χ)−112.0·10−6 cm3/mol
Optical and Spectral Properties 
Wavelength(Max. emission) (nm)435
Wavelength range(nm)400~480
Decay time(ns)1200
Light yield(photons/keV)80
Light output relative to Nal(Tl) (%)130
Refractive index1.85
Radiation length(cm)1.95
Energy resolution(%)<3
X-ray Absorption Coef. at 100 KeV(cm-1)2.88
X-ray Absorption Coef. at 662 KeV(cm-1)0.13
Refractive Index2.05 @ 435nm
Spectrum

Feature
Application
Literature
Feature
  • Extremely high light output
  • Excellent performance at both high and low energies and linearity 
  • Inherent low background radiation
  • Nonproportional thermal dependence
  • Good energy resolution
  • High density
  • Large effective atomic number
Application
  • Gamma-ray spectroscopy
  • Hand-held radiation detection instruments
  • Scintillation detector for safety inspection equipment
  • Ultra-high resolution X-ray imaging
  • Spectroscopy of high energy photons
Literature
[1]  Yokota Y ,  Nishimoto K ,  Kurosawa S , et al. Crystal growth of Eu:SrI2 single crystals by micro-pulling-down method and the scintillation properties[J]. Journal of Crystal Growth, 2013, 375(jul.15):49-52.
[2]  Nishimoto K ,  Yokota Y ,  Kurosawa S , et al. Effects of La, Gd, or Lu co-doping on crystal growth and scintillation properties of Eu:SrI2 single crystals[J]. Journal of Crystal Growth, 2014, 401(sep.1):484-488.
[3] Nikl, Martin, Yokota, et al. Effects of Na and K co-doping on growth and scintillation properties of Eu:SrI2 crystals[J]. Radiation Measurements, 2016.
[4]  Yokota Y ,  Kurosawa S ,  Nishimoto K , et al. Growth of Eu:SrI2 bulk crystals and their scintillation properties[J]. Journal of Crystal Growth, 2014, 401(sep.1):343-346.

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