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EJ-301, EJ-309




EJ-301 exhibits excellent pulse shape discrimination (PSD) properties, particularly for fast neutron counting and spectrometry in the presence of gamma radiation. It is identical to the widely reported NE-213 and exhibits all of the properties of that scintillator.

EJ-309 has been developed as an alternate to the more commonly used low-flash point PSD liquid scintillators based on the solvent xylene. With a flash point of 144°C, it eliminates the fire hazard associated with low-flash point liquid scintillators. While EJ-309 provides slightly poorer PSD characteristics than that of EJ-301, EJ-309 possesses a number of chemical properties recommending it for use in environmentally difficult conditions. These properties include: high flash point, low vapor pressure, low chemical toxicity, and compatibility with cast acrylic plastics. EJ-309 is also available loaded with natural boron as EJ-309B.


Light Output (% Anthracene) 78 80
Scintillation Efficiency (photons/1 MeV e-) 12,000 12,300
Wavelength of Maximum Emission (nm) 425 424
Decay Time, Short Component (ns) 3.2 ~ 3.5
Mean Decay Times of First 3 Componenets (ns)
Bulk Light Attenuation Length (m) 2.5 - 3 >1
Specific Gravity 0.874 0.959
Refractive Index 1.505 1.57
Flash Point (°C) 26 144
Boiling Point (°C at 1 atm) 141  290-300 
Vapor Pressure (mm Hg. at 20°C) 6 0.002
No. of H Atoms per cm3 (x1022) 4.82 5.43
No. of C Atoms per cm3 (x1022) 3.98 4.35
No. of Electrons per cm3 (x1023) 2.27 3.16


EJ-301 Emission Spectrum

EJ-309 Emission Spectrum