CsI crystal (also known as cesium iodide crystal) is one of the scintillation crystals with the highest scintillating efficiency. Pure CsI is also a scintillator, with a very fast decay rate (~10ns), and the peak of the emission spectrum is around 310nm, but its scintillation yield at room temperature is low. The light yield of pure CsI crystal at a low temperature of 77K is as high as 100,000 ph/Mev, which makes pure CsI the most attractive scintillator in the field of cryogenic detectors.
TI: CsI is one of the crystals with the highest scintillating efficiency. The effective wavelength of its emission spectrum is above 500nm, which is very close to the most sensitive detection wavelength of the photodiode. TI: CsI crystal has high light yield, no cleavage surface, low melting point, and is easy to grow. It has a wide range of applications in security detection, neutrino detection, neutrino detection, gamma rays, XCT, and other fields. Sodium-doped cesium iodide (Na: CsI) is an important alkali metal halide inorganic scintillator, which is widely used as a laser thin film and X-ray detection material. The emission peak of the wavelength of Na: CsI is about 420nm, which matches well with the detection wavelength of the photomultiplier tube. Na: CsI is a promising dark matter scientific detection material. However, CsI crystal has an obvious shortcoming that it is easy to deliquesce, so the necessary moisture-proof and sealing measures must be in place.
Parameter
Material Features
| Chemical formula | TI:CsI | Na:CsI | CsI |
| Density (g/cm3) | 4.51 | 4.51 | 4.51 |
| Melting point (℃) | 894 | 621 | 894 |
| Hardness (Mho) | 2 | 2 | 2 |
| Hygroscopic | Slightly | Yes | Slightly |
| Cleavage | No | No | No |
| Solubility (g/100gH2O) | N/A | N/A | / |
| Thermal expansion coeff (C-1) | 54*10-6 | 54*10-6 | 54*10-6 |
Scintillator Properties
| Chemical formula | TI:CsI | Na:CsI | CsI |
| Wavelength(Max. emission) (nm) | 550 | 420 | 315 |
| Wavelength range (nm) | 320- | 300- | 260- |
| Decay time (ns) | 900 | 300 | 16 |
| Light yield (photons/keV) | 54 | 41 | 2 |
| Light output relative to Nal(Tl) (%) | 45 | 85 | 5 |
| Refractive index | 1.8@550nm | 1.84 (@420nm) | 1.95 |
| Radiation length (cm) | 1.86 | 1.86 | 1.86 |
| Optical transmission (um) | TBA | TBA | / |
| Transmittance (%) | TBA | TBA | / |
| Reflection loss/surface (%) | TBA | TBA | / |
| Neutron Capture Cross-section (barns) | 1.47 | TBA | / |
| Afterglow (%) | 0.5-5.0 | 0.5-5.0 | / |
Spertrum
Feature
- High light yield
- Short decay time
- The crystal is easy to grow
- Good optical and mechanical properties
- Cheap price
Application
- γ-ray detection
- PET XCT
- Geological exploration
- Position sensing detector
- Security inspection
