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 CsI- Cesium Iodide


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:



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



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







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Properties

Optical/Scintillation

Units

Value

Wavelength (Max. Emission)

nm

315

Lower Wavelength Cut-off

nm

260

Decay Time

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

Properties

Mechanical

Units

Value

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/100gH0

N/A

CsI Scintillation Crystals - Sizes


Diameters:  Up to 90mm

Lengths:      Up to 300mm






CsI Scintillation Crystal - Properties