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Cerium Bromide

THE detector for homeland security

Introduction

Cerium Bromide is the latest development in room temperature, high resolution scintillation detectors and with a low intrinsic background, is a superior alternative to Lanthanum Halide based scinitillators for applications including: homeland security, high resolution gamma spectrometry, medical imaging and geological exploration.

CeBr3 has high light output, fast response, and shows very high energy and timing resolution. The detector’s features include:

  • Room temperature operation
  • Same form factor as NaI(Tl) detectors
  • Directly compatible with traditional electronics & multi-channel analysers
  • Supplied in sealed metal housing

Properties

  • Density: 5.2 g / cc
  • Emission Wavelength: 380 nm
  • Decay Time: 17ns
  • Radiological Background: Negligible
  • Hygroscopic: Yes
Above an energy of 200 keV the resolution is superior to NaI(Tl). It also shows good proportionality of response over the gamma energy range from 122 to 1274 keV*1 and as cerium is an activator for the luminescence process, the crystal does not need any additional doping to aid scintillation, unlike Lanthanum Halides.

Furthermore CeBr3 scintillation detectors do not suffer from the intrinsic background (self-activity) typical for Lanthanum Halide detectors like LaCl3:Ce and LaBr3:Ce.

In LaBr3 for example, self-activity is primarily due to 138La that emits conversion electrons and β-particles with energy of up to 1.7 MeV. The self-activity due to 138La in LaBr3 has an intrinsic count-rate of ~1.5 events/(cm3/sec). However, the self-activity of CeBr3 (due to 142Ce that emits β-particles with total energy of 4.5 MeV) is 4×10-4 events/(cm3/sec). Thus, the self-activity of CeBr3 is about 3750 times lower than that in LaBr3.*2

While self-activity issues are not critical in PET (which relies on coincidence measurements), the negligible self-activity of CeBr3 makes it more attractive in large radionuclide detection and imaging systems required for homeland security applications. In these systems, large detector volumes are required and the expected extrinsic count-rate can be extremely low which requires detectors with very low background.

CeBr3 is well suited for applications requiring fast response, high count-rates, and good timing resolution. CeBr3 scintillators can also be expected to provide accurate time-of-flight (TOF) information.

Uses

  • Homeland Security
  • Medical Imaging (PET)
  • Gamma Spectrometry
  • Single Photon Emission Computed Tomography (SPECT)
  • Nuclear & Particle Physics Research
  • X-Ray Diffraction (Very fast scintillation material)
  • NDT – Non Destructive Testing
  • Decommissioning & Environmental Monitoring
  • Geological & Oil Exploration
  • NORM Detection
  • Food Contamination Monitoring

Graph Data

CeBr3-Background

Cebr3-51x51-137cs

CeBr3-diff-NaI

CeBr3-Diff-Cebr3

Compared to NaI(tl) (click to open)

NaI(tl) CeBr3
Relative Photoelectron Yield 100 125
Energy (keV) Typical energy resolution (FWHM) % Typical energy resolution (FWHM) %
30 18 22
60 12 15
81 11 13.5
122 9 11
136 8 5
662 6.5 4
1332 4.9 3
2600 4.0 2

*1 – Ref: Paul Schotanus – Scionix
*2 – Ref: K.S.Shah – New Scintillation Detectors of PET – 2010