ELJEN Products List

EJ-331 and EJ-335
Gadolinium Loaded Liquid Scintillators

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The principal applications of these liquid scintillators are neutron spectrometry and neutrino studies.   The neutron capture reaction is gadolinium produces a multiplicity of beta particles with a total energy of about 8 MeV.   Delayed coincidence and pulse shape discrimination techniques are commonly employed with these liquids.  Also, because they are often employed in large volumes both are formulated with high flash point solvents.
The standard gadolinium loading is 0.5% by weight in both liquids.
EJ-331, based on a fully aromatic solvent, provides the maximum light output consistent with long-term stability.   It is also available with gadolinium loadings up to 1.5%.  
EJ-335 contains mineral oil substituted for some of the aromatic solvent for purposes of higher hydrogen content and higher flash point for use in very large tanks.   In this case, 0.5% gadolinium loading is maximum, and lower loadings are available.
EJ-331, EJ-335 Emission Spectrum
PROPERTIES EJ-331 EJ-335
  Gadlinium Content 0.5% w/w 0.5% w/w
  Specific Gravity 0. 90 0. 89
  Light Output ( % of Anthracen ) 68% 55%
  Wavelength of max. Emission 424 nm 424 nm
  Decay Time, short Component 3. 6 nS 3. 8 nS
  Bulk Light Attenuation Length > 4 meters > 4. 5 meters
  Refractive Index 1. 50 1. 49
  Flash Point 44°C ( 111°F ) 64°C ( 147°F )
  ATOMIC COMPOSITION
  No. of H atoms per cm3 5. 27 x 1022 6. 16 x 1022
  No. of C atoms per cm3 4. 00 x 1022 3. 93 x 1022
  No. of Electron per cm3 2. 98 x 1023 3. 06 x 1023
  H: C ratio 1. 32 1. 57

G-tech, Corp.    local representative in Japan
365-1, Sayamagahara, Iruma-shi, Saitama 358-0032
Phone# 04-2935-2777 Fax# 04-2935-2778  
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