Gamma-Neutron Scintillation Detector (CLYC)

The new scintillator Cs2LiYCl6:Ce (CLYC) is the first practical gamma-neutron scintillation 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 NaI or 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 (RIDs). Other applications requiring gamma-neutron detection can also benefit from using CLYC.

Instrument manufacturers will also find the simplicity of implementing a dual-mode detector to be advantageous. The neutron cross-section of 95% 6Li-enriched CLYC is 2.3 times that of 3He (10 atmospheres), compared on a volume basis. Energy resolution for 662 keV gamma rays is better than 5% using CLYC. While the energy resolution of the material varies based on the size and configuration of the detector, CLYC has generally 25 to 30% percent better resolution than sodium iodide.


Good absorber with good stopping powers - density 3.31 g/cm³ and an Effective Z of 54. Fast with a decay time of 1ns Emitting with a 370nm peak. Widespread IR application as spectroscopic windows, prisms and lenses.
Security, Medical physics, Eximer laser windows, High energy Physics, Space
Properties Value
Material (Cs₂LiYCl₆(Ce))
Melting Point 640℃
Density 3.31 g/cm³
Crystal Structure Cubic
Cleavage Planes None
Water Solubility Hygroscopic
Refractive Index (Preliminary Data) 1.81 ± 0.037 @ 405 nm
Coefficient of Thermal Expansion 34.34x10⁻⁶/℃ @ 30℃
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 20,000 ph/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℃
Molecular Weight 78.08
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