• CsI raw crystals
  • CsI: Na with light reflection layer
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Pure CsI Crystal Scintillator

Pure CsI Crystal Scintillator

$20.00 USD
$20.00 USD
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Pure (undoped) CsI (Cesium Iodide) is a high-performance fast scintillator crystal widely used in particle physics, nuclear instrumentation, and time-resolved radiation detection. Unlike doped variants such as CsI(Tl), pure CsI exhibits intrinsic UV scintillation with a sub-10 ns decay time, making it an excellent choice for high count-rate and timing-critical experiments.

With an emission peak near 305 nm, pure CsI is well matched to UV-sensitive PMTs, MCPs, and SiPMs, enabling precise temporal resolution in TOF systems, calorimeters, and fast imaging detectors. Its high effective atomic number (Z) provides strong stopping power for X-rays and gamma rays, while its radiation hardness ensures stability in intense radiation environments.

Pure CsI crystals are commonly deployed in university research laboratories, national facilities, and custom detector prototypes, where timing accuracy outweighs maximum light yield.

Typical Research Applications

  • Time-of-flight (TOF) particle detection
  • High-energy physics calorimeters
  • Fast X-ray and gamma-ray spectroscopy
  • Nuclear and particle beam diagnostics
  • Ultrafast scintillation imaging systems

Available Options

  • Custom sizes: blocks, cylinders, plates
  • Optical-grade polishing
  • Tight dimensional tolerances
  • Optional encapsulation or sealing for moisture protection

Engineering note: Pure CsI provides significantly faster response and lower afterglow than CsI(Tl), but with reduced light output. It is best suited for timing-dominated detector designs

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

Comparison of CsI, CsI:Tl, and CsI:Na

Property CsI:Tl CsI:Na Pure CsI
Light Yield (photons/keV) ~56 ~40 <10
Decay Time ~1 µs ~630 ns <10 ns
Emission Peak ~550 nm ~420 nm 310 nm (fast), 420–600 nm (slow)
Best Detector Compatibility Photodiodes / CCDs PMTs Fast PMTs / UV detectors
Efficiency at Room Temperature Excellent Good Low
Hygroscopic Yes Yes Yes

 

Frequently Asked Questions — Pure CsI Scintillator

What is the difference between pure CsI and CsI(Tl)?
Pure CsI is undoped and exhibits intrinsic UV scintillation with ultrafast decay times (~6–10 ns) and emission near 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 due to limited UV sensitivity.
Is pure CsI hygroscopic?
Yes. Pure CsI is slightly hygroscopic. For long-term stability, crystals are typically operated in controlled environments or supplied with protective coatings or hermetic encapsulation.
What applications benefit most from pure CsI?
Time-of-flight (TOF) particle detection, high-energy physics calorimeters, pulsed radiation measurements, fast X-ray and gamma-ray detection, and ultrafast scintillation imaging systems.
Can you provide custom dimensions and optical polishing?
Yes. Pure CsI crystals are available in custom blocks, cylinders, plates, and other geometries, with optical-grade polishing and tight dimensional tolerances for research and prototype detectors.
Are pure CsI crystals suitable for research and facility use?
Absolutely. Pure CsI scintillators are widely used in university laboratories, national facilities, and custom detector prototypes where timing accuracy is more critical than maximum light output.

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