The Hamamatsu R3991A-28 is a high-gain, side-on type PMT with a bialkali photocathode, designed for ultra-low-light detection in scientific and industrial applications. Its φ28mm metal package provides excellent photon counting capability and fast timing performance.
| Parameter | Specification |
|---|---|
| Photocathode Type | Bialkali (Sb-K-Cs) |
| Spectral Response | 300–650 nm |
| Peak Wavelength | 420 nm |
| Cathode QE (Typ.) | 25% @ 420 nm |
| Anode Luminous Sensitivity | 50 A/lm (Min. @ 1000V) |
| Gain | 1×10⁷ (Typ. @ 1000V) |
| Rise Time | 2.2 ns |
| Transit Time | 24 ns (Cathode to Anode) |
| Dark Current | 5 nA (Max. @ 1000V) |
| Supply Voltage | 1000V (Max.) |
| Package | Metal (φ28 mm) with borosilicate glass window |
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