| Composition | SP102 | ZnS(Ag) |
| Materials | Polystyrene | ZnS(Ag) |
| Density（g/cm3） | 1.023 | 4.1 |
| Refractive Index | 1.58 | |
| Light Output (related to anthracene crystals) | 64% | 280% |
| Emission Peak Wavelength (nm) | 423 | 450 |
| Decay Time (ns) | 2.4 | 200 |
| Operation Temperature Range（℃） | -40～55 | -40～55 |
| Thickness of Coated Layer（mg/cm2） | 4.5 |
Hangzhou Shalom EO has developed the SP121 (Equal to EJ444) series plastic scintillators, which are suitable for both α-ray and β-ray detection. The plastic scintillator SP121 consists of a ZnS(Ag) layer coated on the surface of our plastic scintillator SP102 with the ZnS(Ag) layer thickness typically being 4.5mg/cm2. The plastic scintillator SP102 is for β-ray detection with a peak emission wavelength of 423nm, and the ZnS(Ag) layer is for α-ray detection with peak emission at 450nm. The thickness of the ZnS(Ag) layer is meticulously designed to obtain exactly the desired α-ray absorption. Advanced and sophisticated processing is used to realize ZnS(Ag) coating, which makes the final scintillators have excellent homogeneity and uniformity.
