CsI(Tl) – Thallium Doped Caesium Iodide

CsI(Tl)CsI(Tl) scintillation crystal offers benefits over other materials, primarily in the overall size of the detection system. Because of its maximum emission of 550nm, Thallium doped Caesium Iodide can be paired with Si-photodiodes for detection allowing reduction in the size of the system which does not require photomultiplier tubes.

With its high light output, Caesium Iodide’s high resistance to radiation make it ideal for use in nuclear and medium to high energy physics as well as radiation detection.

As with Roditi’s other crystals, growth methods and processing allow for customisable specifications for your application.

Density [g/cm³] 4.51
Melting point [K] 894
Thermal expansion coefficient [K-¹] 54 x 10-⁶
Cleavage plane none
Hardness (Mho) 2
Hygroscopic Slightly
Wavelength of emission maximum [nm] 550
Lower wavelength cutoff [nm] 320
Refractive index at emission maximum 1.79
Primary decay time [µs] 1
Afterglow (after 6ms) [%] 0.5 - 5.0
Light yield [photons/MeV γ] 52- 56 x10³
Photoelectron yield [% of NaI(Tl)] (y rays) 45