Undoped CsI also called CsI(pure) has an emission maximum at 315 nm with an intensity much smaller than either of the activated types of this material. But, this emission is characterized by a relatively short decay time of 16 ns, thus the material can be used for fast timing applications.
Fast decay time
CsI is slightly hygroscopic. Contact with water and high humidity should be avoided.
Standard size is between 1” diameter x 1” to 3” diameter x3”, but length up to 12” can be manufactured
|Melting point [K]||894|
|Thermal expansion coefficient [C-1]||54 x 10-6|
|Wavelength of emission max. [nm]||315|
|Lower wavelength cutoff [nm]||260|
|Refractive index @ emission max||1.95|
|Primary decay time [ns]||16|
|Light yield [photons/keVγ||2|
|Photoelectron yield [% of NaI(Tl)] (for γ-rays)||4-6|