Tuotteet » Säteilymittaus » Laboratorio- ja Spektroskopia » Detectors » Crystal Scintillators » New Product-fi

CsI(Tl) and CsI(Na)

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

Cesium Iodide is a material with high γ-ray stopping power due to its relative high density and atomic number. For scintillation counting, it is used either in its undoped form or doped with sodium or thallium. CsI is resistant to thermal and mechanical shock. The physical characteristics of CsI are independent of the activator used. Compared to NaI(Tl), it is relatively soft and plastic, and does not cleave. Because it has no cleavage plane, it is quite rugged – which makes it well-suited for well logging, space research or other applications where severe shock conditions are encountered. CsI is slightly hygroscopic. Contact with water and high humidity should be avoided. 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). 

Density: 4.51 g/cm³
Melting point: 894 K
Thermal expansion coefficient: 54 x 10-6 C-1
Cleavage plane: none
Hardness (Mohs): 2
Hygroscopic: yes
Wavelength of emission max.:420 nm
Lower wavelength cutoff: 300 nm
Refractive index @ emission max 1.84
Primary decay time: 630 ns
Light yield: 41 photons/keVγ
Photoelectron yield (for γ-rays): 85% of NaI(Tl)