BC-428
Green-Emitting Plastic Scintillators
BC-428 is a clear, transparent plastic scintillator with bright green fluorescence. It is intended for use with photodiodes and charged coupled devices (CCDs) which have optical sensitivities in the green and red portions of the spectrum. Phoswich detectors and other special systems which use optical techniques advantageously for background reduction and selected signal enhancement also may employ BC-428.
Comparing BC-428 to BC-400 scintillator shows that BC-428 has about the same scintillation efficiency. However, its relative light output is 56% of BC-400’s with bialkali photocathode PMTs and 85% with S-11 PMTs.
Specifications
Properites
General Technical Data
| Light Output, %Anthracene | 36 |
| Rise Time (10-90%), ns | 1.6 |
| Integral Rise Time (10-90%), ns | 30 |
| Decay Time (1/e), ns | 12.5 |
| Wavelength of Max. Emission, nm | 480 |
| Light Attenuation Length, 10 mm sheet, cm | 150 |
| Atomic Composition | |
| No. H Atoms per cc (x1022) | 5.23 |
| No. C Atoms per cc (x1022) | 4.74 |
| Ratio H:C Atoms | 1.103 |
| No. of Electrons per cc (x1023) | 3.37 |
| Base | Polyvinyltoluene |
| Density [g/cc] | 1.023 |
| Expansion Coefficient (peroC,<67oC) |
7.8X10-5 |
| Refractive index | 1.58 |
| Softening Point | 70°C |
| Vapor Pressure | May be used in vacuum |
| Solubility | Soluble in aromatic solvents, chlorinated solvents, acetone, etc. Unaffected by water, dilute acids, lower alcohols, alkalis and pure silicone fluids or grease. |
| Light Output | At +60oC = 95% of that at+20oC. Independent of temperature from -60oC to +20oC |