Ce: YAP crystal (Chemical formula Ce: YAlO3, also known as cerium-doped yttrium aluminate crystal) is a scintillation crystal with excellent comprehensive performance, which is widely used in the field of scientific research and industrial high-energy ray detection. The absorption peak and excitation peak of YAP crystal are mainly concentrated in 230-300nm, and the emission wavelength is in the range of 350-390nm, which matches well with the receiving sensitive wavelength range of photomultiplier tube (PMT) and silicon photodiode (PD).

Ce: YAP shows stable physical and chemical properties, high thermal conductivity, and resistance to harsh operating environments. It exhibits excellent scintillating performance, for example, high scintillating efficiency, high light yield, and fast decay time (about 27ns). Ce: YAP crystals are widely used in photomultiplier tubes, photoelectric counters, scintillation screens, and other devices to realize the detection of high-energy particles, such as α particles, β rays, γ rays, extreme ultraviolet rays, etc.  Because of the excellent scintillation performance of Ce: YAP crystal, it is widely used in CT, scanning electron microscope SEM, and other equipment. In particular, it has a strong ability to stop charged particles; it has high detection efficiency for gamma rays but is relatively insensitive to neutrons. So it can be used for the resolution and measurement of gamma rays in the neutron-gamma mixed radiation field.  For the 137Cs-γ rays radiation source, it shows excellent energy resolution which reached 5.7% (one of the best measured with a scintillation detector), and for 60Co-γ rays radiation source with a threshold of 1MeV, it shows excellent time resolution with reached 160ps.


Material Features

Chemical formulaCe: YAP
Density (g/cm3)5.37
Melting point (℃)1875
Hardness (Mho)8.5
Solubility (g/100gH2O)N/A
Thermal expansion coeff (C-1)(4-11)*10-6

Scintillator Properties

Wavelength(Max. emission) (nm)370
Wavelength range (nm)325-425
Decay time (ns)28
Light yield (photons/keV)25
Light output relative to Nal(Tl)  (%)60-70
Refractive index1.95@370nm
Radiation length (cm)2.7
Optical transmission (um)TBA
Transmittance (%)TBA
Reflection loss/surface (%)TBA
Energy resolution (%)≤ 5
Neutron Capture Cross-section (barns)TBA
Afterglow (%)<0.005 @ 6ms



  • Not sensitive to neutrons
  • Stable physical and chemical properties
  • High γ-ray detection efficiency
  • Fast decay time (about 27ns)
  • High light yield
  • High sensitivity and high resolution
  • Excellent scintillating efficiency


  • X-ray, β-ray detection
  • 137Cs-γ rays
  • 60Co-γ rays
  • Photoelectric counter
  • Flashing screen
  •  PET
  • scintillator screens


[1] Comparison between YAP : Ce and CsI(Tl) multipillar matrices[J]. Nuclear Instruments & Methods in Physics Research A, 1998, 418(2-3):497-506.
[2] Bourret, Edith, D, et al. Consequences of Ca Codoping in YAlO3:Ce Single Crystals[J]. Chemphyschem A European Journal of Chemical Physics & Physical Chemistry, 2017.
[3] Cao D ,  Zhao G ,  Chen J , et al. Effects of growth atmosphere and annealing on luminescence efficiency of YAP:Ce crystal[J]. Journal of Alloys & Compounds, 2010, 489(2):515-518.

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