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PLASTIC SCINTILLATOR PAINT

EJ-296

 

EJ-296

 

EJ-296 is a solution of plastic scintillator materials dissolved in a xylene solvent to form a paint for fabricating ultra-thin films or for applying directly to a customer's support surface. Scintillator films as thin as 0.1 micrometer can be made by forming the films on a water surface. Spin casting techniques have also been used successfully to form films of well controlled thickness. EJ-296 is a moderately viscous solution which may be applied as received. For making thinner films, the paint can be thinned with additional solvent.

The fluor system of EJ-296 has been formulated specifically for the fabrication of thin films with two specific considerations in mind: (1) Vacuum compatibility and (2) maximum shifting of the primary scintillation light in thin films. Because the base solvent is xylene, care should be taken in handling and storing EJ-296 with regard to potential flammability. Always work in a well ventilated area.

 

PROPERTIES EJ-296
Light Output (% Anthracene) 60
Scintillation Efficiency (photons/1 MeV e-)
9,000
Wavelength of Maximum Emission (nm) 435
Rise Time (ns)
~ 1.0
Decay Time (ns) ~ 2.5
Pulse Width, FWHM (ns) ~ 3.5
No. of H Atoms per cm3 (x1022) 5.17
No. of C Atoms per cm3 (x1022) 4.69
No. of Electrons per cm3 (x1023) 3.33
Density (g/cm3) 1.02

 

Polymer Base Polyvinyltoluene
Refractive Index 1.58
Softening Point 75°C
Vapor Pressure 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
Temperature Range -20°C to 60°C

 

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 this scintillator.
 
 
EJ-296 Emission Spectrum

 

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