The 9902B Photomultiplier Tube is an advanced optical sensor designed for precision and reliability in various scientific applications. With a diameter of 38 mm (1.5 inches), this photomultiplier features an end window construction that houses a bialkali photocathode, enhancing its sensitivity to green light. The tube is equipped with 10 high-gain, high-stability SbCs dynodes, which are linearly focused to ensure excellent linearity and timing performance. This design makes the 9902B an ideal choice for experiments requiring accurate detection and measurement of light.

One of the standout characteristics of the 9902B is its impressive spectral response. The photomultiplier offers a spectral range from 290 nm to 680 nm, where the quantum efficiency exceeds 1% of the peak, ensuring reliable performance across a wide spectrum. The window is constructed from borosilicate, with a refractive index of 1.49, further enhancing its optical properties. These features make the 9902B well-suited for applications in high-energy physics, where precise photon detection is crucial.

In terms of performance, the 9902B demonstrates remarkable stability and resolution. It boasts a quantum efficiency of 28% at peak, with a luminous sensitivity of 100 µA/lm. The photomultiplier also exhibits excellent pulse height resolution and single electron response (SER), crucial for detailed and accurate measurements. The dark current is minimal, ensuring low noise interference in sensitive experiments. Moreover, the 9902B is designed to withstand various environmental conditions, with a wide operating temperature range and resistance to magnetic fields, making it versatile for use in diverse research settings.