LaBr3
Ce:LaBr3 crystal (also known as cerium-doped lanthanum bromide crystal) is one of the new generation of gamma radiation detector materials based on inorganic scintillators. Its emission spectrum is in the range of 360nm-410nm, which matches well with the sensitive wavelength range of the photomultiplier tube (PMT) and silicon photodiode (PD).
The Ce:LaBr3 crystal shows stable chemical properties. Its refractive index is close to that of the photomultiplier tube, and it shows excellent scintillating performance, such as high energy resolution, high light output (61000ph/Mev), and fast decay time (about 30ns). Which is an ideal substitute for the traditional scintillation crystal NaI. Ce: LaBr3 crystals are widely used in photomultiplier tubes, photocounters, scintillating screens and other devices to detect high-energy gamma rays. Because of the excellent scintillation properties of Ce:LaBr3 crystal, it has been widely used in nuclear physics, geophysics, petroleum exploration, medical imaging.
Parameter
| Property | Value |
| Materials | LaBr3 |
| Density (g/cm3) | 5.2 |
| Melting point (℃) | 1116 |
| Hardness (Mohs) | 3 |
| Molar mass | 378.62 g/mol |
| Appearance | white solid, hygroscopic |
| Boiling point | 1,577 °C (2,871 °F; 1,850 K |
| Solubility in water | Very soluble |
| Property | Value |
| Coordination geometry | Tricapped trigonal prismatic |
| Decay time (ns) | 25 |
| Light yield (photons/keV) | 63 |
| Crystal structure | hexagonal |
| Radiation length (cm) | 1.881 |
| Attenuation(mm)@511keV | 22 |
| Emission peak wavelength(nm) | 370 |
| Reflection loss/surface (%) | 6.8 |
| Radiation Length(g·cm-2) | 9.95 |
| Moliere Radius(cm) | 2.816 |
| Energy resolution(%)@662keV | 2.9 |
 |  |
| LaBr3 Emission Spectra | LaBr3 attenuation with coherent scattering |
Feature
- Chemical inert
- Fast decay time
- High scintillating efficiency
- High sensitivity,
- High energy resolution
Application
- γ-ray detection
- X-ray medical imaging
- Nuclear physics
- Nuclear radiation detection
- Geophysics
- Petroleum exploration
Reference
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