PLASTIC SCINTILLATOR PAINT
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 -60°C to 20°C
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| Temperature Range | -60°C to 60°C |
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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.
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