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Natrium-doped Cesium Iodine [CsI(Na)] Crystals

  • High γ -ray stopping power
  • High density and atomic number
  • Well-suited for well logging, space research and other harsh environment applications

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Basic Properties:

Melting Point (°C) 894 Density (g/cm3) 4.51
Cleavage Plane None Hardness(Mohs) 2
Hygroscopic Yes Refractive Index at Emission Peak 1.84
Emission Peak Wavelength 420 Lower Wavelength Cutoff(nm) 300
Decay Time(ns) 630 Light Yield(Photons/KeV) 41
Photoelectron Yield(% of NaI(Tl)) 85


Sodium doped Cesium Iodide or CsI(Na) CsI(Na) has a wavelength of emission peak at 420nm and is well matched to the photocathode sensitivity of bialkali photomultiplier and has a light output yielding to 85% of NaI(Tl). Compared to NaI(Tl), it is a relatively soft and plastic material without cleavage plan which makes the material interesting where severe environmental conditions are encountered. 
High output γ -ray stopping power 
High density and atomic number 
Suitable for harsh environmental applications