CsI - Cesium Iodide Scintillator Crystal

CsI Scintillation Crystals

Cesium Iodide - CsI -has good stopping power due to its high density and high Z, a fast decay time and a emission peaking at 320nm. CsI scintillators are one of the lowest cost fast scintillators.

Cesium Iodide - CsI scintillator crystals are:

  • Good absorbers with good stopping powers - density 4.51 g/cm³ and an Effective Z of 54
  • Are fast with a decay time of 16ns
  • Emitting with a 320nm peak
  • Robust with good mechanically characteristics

Cesium Iodide - CsI scintillator crystals have the following issues which should be noted. They are:

  • Relatively poor emitters - emitting 4,000 photons/MeV (5% of NaI(Tl))
  • Are slightly hygroscopic

Cesium Iodide - CsI scintillator crystals are useful in diverse applications such as:

  • Specialist applications in high energy, nuclear, space and medical physics

CsI Scintillation Crystals - Optical Properties

Property Units Value
Wavelength (Max. Emission) nm 315
Wavelength Range nm 260 -
Decay Times ns 16
Light Yield photons/keV 2
Photoelectron Yield % of NaI(Tl) 5
Radiation Length cm TBA
Optical Transmission µm TBA
Transmittance % TBA
Refractive Index 1.95(@315nm)
Reflection Loss/Surface % TBA
Neutron Capture Cross-section barns TBA

CsI Scintillation Crystals - Mechanical Properties

Property Units Value
Chemical Formula CsI
Density g/cm³ 4.51
Atomic Number (Effective) 54
Melting Point ºK 895
Thermal Expansion Coeff. C⁻¹ 54.0 x 10⁻⁶
Cleavage Plane None
Hardness Mho 2
Hygroscopic Slightly
Solubility g/100gH₂0 N/A

Further Reading/Publications

Sizes

Property Value
Diameters 90 mm max.
Lengths 300mm max.

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