Phone: (325)-235-4276     Toll Free: (888)-800-8771     Email:


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

Printable PDFs

Available Sizes

Cylinders up to 127 mm diameter x 200 mm long and plates up to 25 mm thick x 250 mm x 250 mm can be supplied. Precision imaging arrays with square pixels with cross sections as small as 0.75 mm can also be supplied.