CsI(Tl) Arrays

Thallium doped cesium iodide (or CsI(Tl)) is one of the brightest scintillators with the fluorescence spectrum with maximum at 550nm, which allows using photodiodes for detection of the emission. Because a scintillator-photodiode pair can be used, it is possible to reduce significantly the size of the detection system, to do without a high-voltage power supply, and to use the detection system in magnetic fields. CsI(Tl) has a high effective atomic number and consequently larger cross-section of the gamma-radiation photoabsorption.