CLYC Gamma-Neutron Scintillator

Cs2LiYCl6:Ce (CLYC): a dual-mode gamma-neutron scintillator is the first practical detector for use as a replacement for both medium resolution gamma-ray detectors and Helium-3 proportional counter tubes for neutron detection. The ease of using Pulse Shape Discrimination (PSD) for neutron detection, combined with better gamma-ray resolution than Sodium Iodide (NaI) or Caesium Iodide (CsI), make the CLYC detector an ideal solution for several classes of handheld instruments, including Personal Radiation Detectors (PRDs), Spectroscopic Personal Radiation Detectors (SPRDs), and Radioisotope Identification Devices (RIIDs).

Contact RMD

  • Material: Cs2LiYCl6:Ce
  • Melting Point: 640°C
  • Density: .3.31 g/cm3
  • Crystal Structure: Cubic
  • Cleavage planes: None
  • Water Solubility: Hygroscopic
  • Refractive Index: 1.81 ± 0.037 @ 405 nm
  • Coefficient of Thermal Expansion: 34.34×106/°C @ 30°C
  • Emission Spectral Range: 275 – 450 nm
  • Peak Scintillation Wavelength: 370 nm
  • Decay Constants (CVL. Ce3+, Ce-STE): 1 ns, 50 ns, 1000 ns
  • Scintillation Light Yield: 20,000 ph/MeV
  • GEE for Thermal Neutrons: 3.2 MeV
  • X-ray Absorption Coef. at 100 KeV: 3.97 cm·1
  • X-ray Absorption Coef. at 662 KeV: 0.251 cm·1
  • Radiation Length: 3.42 cm
  • Heat Capacity: 0.379 J/(g*K)
  • Thermal Conductivity: 0.0067 W/(cm *K) at 50°C

CLYC Properties: PDF


  • 25mm diameter/25mm long cylinder
  • 38mm diameter/38mm long cylinder
  • 50mm diameter/50mm long cylinder
  • 75mm diameter/75mm long cylinder

Package Style

  • Sealed package
  • Sealed package and permanently mounted to a photomultiplier tube (PMT)

Energy Resolution

<= 5% FWHM at 662keV line of 137Cs
(obtained at 220C with an appropriate PMT and integration time constant on the pulse height electronics)

CLYC Configurations: PDF


3″ CLYC Pulse Height Analysis

Growing CLYC in Microgravity

RMD collaborated with NASA on growing crystals of Cs2LiYCl6:Ce CLYC gamma-neutron scintillator crystals in microgravity. High-quality crystals are essential to a wide variety of applications and the microgravity environment produces better quality crystals. Analyzing CLYC crystals grown in microgravity helps researchers better understand exact conditions needed to produce the highest-quality, defect-free crystals. Insights from this work supported commercial scale development of CLYC scintillators at RMD.

More on NASA’s CLYC Experiment

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