CsI(Tl Single Crystal Scintillator

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CsI(Tl Single Crystal Scintillator For Sale

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CsI(Tl Single Crystal Scintillator:
$100.00

CsI(Tl) (Thallium-doped Cesium Iodide) is one of the most widely used inorganic scintillator crystals for X-ray and gamma-ray detection, valued for its very high light yield, excellent stopping power, and emission spectrum well matched to silicon photodetectors. By introducing trace amounts of thallium activator ions into the CsI lattice, the scintillation efficiency is significantly enhanced, resulting in bright green emission centered around 550 nm.

Compared with undoped CsI, CsI(Tl) provides substantially higher light output, enabling improved signal-to-noise ratio and reliable energy discrimination in low-to-moderate count-rate applications. Its emission wavelength closely matches the peak sensitivity of photodiodes, avalanche photodiodes (APDs), and silicon photomultipliers (SiPMs), allowing compact, rugged detector designs without the need for UV-sensitive photomultiplier tubes.

With a high effective atomic number (Z) and density (~4.51 g/cm³), CsI(Tl) offers strong absorption efficiency for X-rays and gamma rays, making it suitable for medical imaging systems, security scanners, radiation monitoring instruments, and laboratory spectroscopy setups. While its decay time (~1 µs) is slower than fast scintillators such as pure CsI or LaBr₃, it remains well suited for applications where light yield and detection efficiency are prioritized over timing resolution.

CsI(Tl) crystals are commonly supplied in blocks, plates, pixels, or custom geometries, with optical-grade polishing and optional surface treatments. Due to its slightly hygroscopic nature, CsI(Tl) is typically encapsulated or sealed for long-term stability in practical detector assemblies.

Typical Applications

Medical X-ray and CT imaging
Gamma-ray spectroscopy
Radiation monitoring and dosimetry
Security and industrial inspection systems
University and national-lab detector research

Below is a clear comparison of the properties of pure CsI, CsI:Tl, and CsI:Na:

Comparison of CsI, CsI:Tl, and CsI:NaPropertyCsI:TlCsI:NaPure CsILight Yield (photons/keV)~56~40<10Decay Time~1 µs~630 ns<10 nsEmission Peak~550 nm~420 nm310 nm (fast), 420–600 nm (slow)Best Detector CompatibilityPhotodiodes / CCDsPMTsFast PMTs / UV detectorsEfficiency at Room data-start="2022" data-end="2157">Contact us before order!

What is the difference between pure CsI and CsI(Tl)?

Pure CsI is undoped and offers ultrafast decay times (~6–10 ns) with UV emission at ~305 nm. CsI(Tl) provides much higher light yield but has a slower decay time (~1 µs). Pure CsI is preferred for timing-critical applications.

What photodetectors are compatible with pure CsI?

Pure CsI is best coupled with UV-sensitive photomultiplier tubes (PMTs), microchannel plates (MCPs), or UV-enhanced SiPMs. Standard silicon photodiodes are generally not suitable.

Is pure CsI hygroscopic?

Pure CsI is slightly hygroscopic. For long-term stability, controlled environments, protective coatings, or hermetic encapsulation are recommended.

What applications benefit most from pure CsI?

Applications requiring fast timing such as time-of-flight systems, particle physics detectors, pulsed radiation measurements, and high-rate X-ray or gamma-ray detection.

Can you provide custom dimensions and polishing?

Yes. Custom geometries, optical-grade polishing, and tight tolerances are available to meet specific detector and experimental requirements.

What is CsI(Tl)?

CsI(Tl) is thallium-doped cesium iodide, a high-light-yield inorganic scintillator used for X-ray and gamma-ray detection.

What are the main advantages of CsI(Tl)?

CsI(Tl) offers very high light output, good energy resolution, strong X-ray and gamma stopping power, and emission well matched to silicon photodetectors.

What is the emission wavelength of CsI(Tl)?

CsI(Tl) emits green light with a peak around 550 nm, ideal for photodiodes, APDs, and SiPMs.

How does CsI(Tl) compare to pure CsI?

CsI(Tl) provides much higher light yield but has a slower decay time (~1 µs). Pure CsI is faster but emits in the UV with lower light output.

Is CsI(Tl) hygroscopic?

CsI(Tl) is slightly hygroscopic and is usually encapsulated or sealed to ensure long-term stability.

What are typical applications of CsI(Tl)?

Medical imaging, gamma spectroscopy, radiation monitoring, security scanning, and university detector research.

Yes. Custom geometries, optical-grade polishing, and tight tolerances are available to meet specific detector and experimental requirements.