CAESIUM IODIDE CAS#7789-17-5

Outstanding Scintillation Luminous Property
Our cesium iodide and thallium-doped cesium iodide CsI(Tl) crystals deliver remarkably high scintillation conversion efficiency with abundant light output. Thanks to their exceptional response to various rays, they stand out as premium core raw materials for sensing high-energy particles and all types of ionizing radiation, guaranteeing sensitive, stable signal capture in all radiation detection scenarios.
Powerful X-Ray Response & Unmatched X-Ray Detecting Performance
The CsI(Tl) scintillator thin films we supply feature outstanding X-ray absorption capacity and ultra-efficient radiation-to-visible-light conversion efficiency. They can rapidly convert incident X-ray energy into detectable optical signals with low noise, performing brilliantly across medical radiography, industrial non-destructive testing and other X-ray imaging use cases.
Ultra-High Spatial Resolution for Precise Digital Imaging
Our CsI(Tl) scintillation films are engineered to achieve superior spatial resolution with fine detail reproduction and clear edge rendering. They support ultra-precise image acquisition without blurring or distortion, greatly boosting the overall imaging quality and detection accuracy of cutting-edge digital X-ray imaging equipment.
Perfect Spectral Matching & Great Compatibility with Silicon Detectors
CsI(Tl) scintillators boast well-matched emission spectrum with silicon readout sensor arrays, enabling maximum photoelectric coupling efficiency and minimal optical signal loss. This outstanding compatibility allows seamless integration with mainstream silicon-based photoelectric components, making them universally applicable in all modern optoelectronic imaging devices.

Product Description: Cesium Iodide, CAS No. 7789-17-5

Cesium iodide (CsI), together with its thallium-doped derivative CsI(Tl) and other inorganic halide scintillants, serves as a core scintillation medium for equipment built to track high-energy particles and monitor ionizing radiation. Manufactured via vacuum deposition, CsI(Tl) thin films were first developed as premium photoelectric conversion layers and quickly became a foundational material for X-ray imaging technology.

When deployed in state-of-the-art digital X-ray imaging equipment, CsI(Tl) scintillator thin films remain the preferred choice thanks to three standout core strengths. They deliver exceptional X-ray light conversion efficiency for stable, high-signal output, produce crisp imaging with superior spatial resolution to capture tiny structural details, and feature ideal spectral alignment with silicon sensor readout panels. This seamless matching with silicon detection chips minimizes light signal loss, enabling broad, reliable integration into all mainstream modern digital X-ray imaging systems.

Melting point	626 °C (lit.)
Boiling point	1280 °C
density	4.51 g/mL at 25 °C (lit.)
refractive index	1.7876
Fp	1280°C
storage temp.	Keep in dark place,Inert atmosphere,Room temperature
solubility	soluble in ethanol, methanol, acetone
form	beads
Specific Gravity	4.51
color	White
PH	pH(50g/l, 25℃) : 5.0～9.0
Water Solubility	74 g/100 mL (20 ºC)
Sensitive	Hygroscopic
Merck	142014
Exposure limits	ACGIH: TWA 0.01 ppm
Dielectric constant	5.6（Ambient）
Stability:	Stable. Deliquescent.
CAS DataBase Reference	7789-17-5(CAS DataBase Reference)
NIST Chemistry Reference	Cesium iodide(7789-17-5)
EPA Substance Registry System	Cesium iodide (CsI) (7789-17-5)
Hazard Codes	Xn,Xi
Risk Statements	36/37/38-42/43-43
Safety Statements	22-36/37-45
RIDADR	UN 3077 9 / PGIII
WGK Germany	2
RTECS	FL0350000
F	8
TSCA	Yes
HS Code	28276000
Toxicity	LD50 i.p. in rats: 1.4 g/kg (Cochran)

Cesium iodide crystals are vital scintillation materials adopted in electromagnetic calorimeters for particle physics experiments, and they are also popular optical spectroscopic elements for Fourier transform infrared (FT-IR) spectrometers.

In contrast to conventional potassium bromide spectroscopy crystals, cesium iodide possesses a broader optical transmission spectrum, which covers an extended far-infrared wavelength band. Nevertheless, the material is soft and free of natural cleavage planes, bringing certain difficulties to the processing of ultra-flat, high-gloss polished surfaces.

Cesium iodide optical crystals must be preserved under dry conditions to avoid chemical deterioration caused by moisture absorption. A germanium coating deposited on the crystal surface can greatly mitigate moisture interference when installing and replacing components in spectrometers.

previous : Formaldehyde CAS#50-00-0

next : N,N-Dimethyl-N-dodecyl-N-(2-hydroxy-3-sulfopropyl)ammonium betaine CAS#13197-76-7