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EJ-299-33A, EJ-299-34


EJ-299-33A EJ-299-34


EJ-299-33A pulse-shape discriminating (PSD) plastic scintillator enables the separation of gamma and fast neutron signals on the basis of their timing characteristics using conventional PSD electronics systems. Cylinders up 127 mm diameter x 127 mm long can be supplied.

EJ-299-34 was developed as an alternative to EJ-299-33A. Although EJ-299-33A has the appearance and feel of a standard plastic scintillator, it is somewhat softer and therefore more difficult to machine and polish. While its PSD properties are slightly poorer than those of EJ-299-33A, EJ-299-34 is a harder plastic that is more easily machined and polished to high tolerances. It can be cast in sheet form primarily for the manufacture of small precision rectangular bars in the making of imaging arrays. To date, sheets up to 15 mm x 250 mm x 250 mm have been cast in large numbers and with good product uniformity.

At this time, EJ-299-33A and EJ-299-34 are both still under development. These products are sold under license from Lawrence Livermore National Laboratory.


Light Output (% Anthracene) 56
Scintillation Efficiency (photons/1 MeV e-) 8,600
Wavelength of Maximum Emission (nm) 420
No. of H Atoms per cm3 (x1022) 4.36
No. of C Atoms per cm3 (x1022) 4.84
No. of Electrons per cm3 (x1023) 3.46
Density (g/cm3) 1.08
Approx. Mean Decay Times of First 3 Components (ns)
Gamma Excitation
Neutron Excitation
13, 35, 270
13, 50, 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-299-33A & EJ-299-34 Emission Spectrum