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EJ-276 & EJ-276G

(Formerly EJ-299-33A, EJ-299-34)


EJ-276 EJ-276G


EJ-276 pulse-shape discriminating (PSD) plastic scintillator enables the separation of gamma and fast neutron signals on the basis of their timing characteristics. This scintillator replaces all versions of EJ-299-33 and EJ-299-34 PSD scintillators and embodies the following improvements:

  • Excellent physical hardness, equal to or superior to that of standard plastic scintillators
  • Long-term stability of scintillation and optical characteristics
  • Basic PSD properties increased to being comparable to the best liquid scintillators

EJ-276G with green fluorescence is also available for use with solid-state sensors.


Light Output (% Anthracene) 56 52
Scintillation Efficiency (photons/1 MeV e-) 8,600 8000
Wavelength of Maximum Emission (nm) 425 490
No. of H Atoms per cm3 (x1022) 4.53 4.53
No. of C Atoms per cm3 (x1022) 4.89 4.89
No. of Electrons per cm3 (x1023) 3.52 3.52
Density (g/cm3) 1.096 1.096
Approx. Mean Decay Times of First 3 Components (ns)  Gamma Excitation 13, 35, 270
Neutron Excitation 13, 59, 460
Chemical Compatibility
Attacked by: Aromatic solvents, Chlorinated solvents, Ketones, Solvent bonding cements, etc.
Stable in: Water, Dilute acids and alkalis, Lower alcohols, and Silicone greases.
It is safe to use most epoxies with these scintillators.


EJ 276 Emission Spectrum