Thallium-doped cesium iodide, CsI(Tl), is one of the brightest scintillators, with its emission peak located at 550 nm, well within its 350–700 nm emission spectrum. This range aligns great with the spectral sensitivity of photodiodes, making CsI(Tl) ideal for pairing with photodiodes in scintillation detectors. Such a pairing enables the elimination of high-voltage power supplies and reduces the influences of magnetic fields.

In addition to its optical compatibility, CsI(Tl) boasts a large effective atomic number, which enhances its gamma-radiation photoabsorption efficiency due to a larger cross-section. Its exceptional stopping power and robust mechanical properties, combined with good radiation hardness, make it a reliable choice for demanding environments.

Pixellated scintillator arrays, constructed by arranging scintillator crystal pixels in a grid pattern and isolating them with reflectors, further expand its usage. This design enhances spatial resolution and ensures that scintillation light generated by incident radiation is confined to the corresponding pixel, enabling precise localization of the event. These arrays can be formed as 2-dimensional or 1-dimensional (linear) matrices, allowing signals to be captured and integrated into images. With its unique combination of properties, CsI(Tl) scintillation arrays are highly suited for applications in high-energy physics, medical imaging, well-logging, and aviation technologies.

Shanghai North Optics provides 1-dimensional or 2-dimensional CsI(Tl) pixelated arrays ideal for the X-radiation scanning systems for medical imaging and security applications. Photodiodes can be assembled with a CsI(Tl) array if required. Depending on growth conditions, Low-afterglow CsI(Tl)  scintillators optimized for tomography applications can also be obtained, these low afterglow CsI(Tl) crystals have typical afterglow values of 0.05~0.39%@2ms, but we can also customize the afterglow values. You might click on the bold text to learn more if you are interested.

Applications:

1. Medical X-ray Computer Tomography (CT)
2. Environmental monitoring:  gamma-radiation monitoring
3. Security control:  active portal monitors, X-radiation scanning systems, radiation isotope identification devices
4. Industrial –health physics, neutron activation analysis, non-destructive testing
5. High Energy Physics (HEP) and Electromagnetic calorimeter of Astrophysics
6. Position sensitivity detectors

Drawing:

The figure below illustrates the design of a CsI(Tl) pixellated array, consisting of CsI(Tl) pixels and TiO2 reflectors.