ELJEN Products List EJ-200 plastic Scintillator distributed by
This plastic scintillator combines the two important properties of long attenuation length and fast timing and is therefore particularly useful for time-of-flight systems using scintillators greater than one meter long. Typical measurements of 4 meter optical attenuation length are achieved in strips of cast sheet in which a representative size is 2cm x 20cm x 300cm.

The combination of long attenuation length, high light output, and emission spectrum well matched to the common photomultipliers recommends EJ-200 as the detector of choice for many industrial applications such as gauging and environmental protection where high sensitivity of signal uniformity are critical operating requirements.

  Physical and Scintillation Constants:
  Light Output, % Anthracene 64% EJ-200 emission spectrum
  Scintllation effici., photons/1MeV e¯ 10,000
  Wavelength of max emission, nm 425
  Rise Time, nSec 0. 9
  Decay Time, nSec 2. 1
  Pulse Width [FWHM], nSec ~ 2. 5
  No. of H atoms per cm3 x 1022 5. 23
  No. of C atoms per cm3 x 1022 4. 74
  No. of electrons per cm3 x 1023 3. 37
  Density, g/cc 1. 032
Polymer Base:   Polyvinyltoluene
Refractive Index:   1. 58
Vapor Pressure:   Is vacuum-compatible
Coefficient of Linear Expansion:   7. 8 x 10-5 below +67°C
Light Output vs. Temperature:   at +60°C, L.O.=95% of that at +20°C
  No change from +20°C to -60°C
Chemical Compatability:   Is attacked by aromatic solvents, chlorinated solvents,
  ketones, solvent bonding cements, etc. 
  It is stable in water, dilute acids and alkalis,
  lower alcohols and silicone greases.  It is safe to use
  most epoxies and "super glues" with EJ-200.

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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