78mm Blue-Green Sensitive Photomultiplier Tube 9821B with Bialkali Photocathode
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since 2014
Description
The 9821B is a high-performance photomultiplier tube designed for precision applications requiring fast timing and high sensitivity. With a diameter of 78 mm (3 inches), this end-window photomultiplier is equipped with a blue-green sensitive bialkali photocathode. The photocathode is mounted on a plano-concave window, which facilitates efficient light collection. The device features 12 beryllium copper (BeCu) dynodes arranged in a linear-focused design, ensuring excellent linearity and timing characteristics. This makes the 9821B an ideal choice for applications in high-energy physics studies and scintillation spectroscopy.
The photomultiplier is engineered to deliver superior single electron response (SER) and high pulsed linearity. It operates effectively within a spectral range of 285 to 630 nm, with a peak quantum efficiency of 30%. The luminous sensitivity of the 9821B reaches up to 75 µA/lm, making it highly sensitive to low light levels. The device is designed to perform optimally even in challenging conditions, maintaining a low dark current at 20 ºC and offering reliable performance across its operational range.
With its robust construction and advanced design, the 9821B photomultiplier is built to withstand rigorous use. It boasts a nominal anode sensitivity of 500 A/lm, which can be increased to a maximum rated anode sensitivity of 2000 A/lm. The photomultiplier's timing capabilities are highlighted by a single electron rise time of 2.1 ns and a full width at half maximum (FWHM) of 3.2 ns, ensuring rapid and accurate detection of fast events. Additionally, the 9821B is designed to minimize the effects of external magnetic fields and temperature variations, making it a reliable component in precision measurement systems.
78mm Blue-Green Sensitive Photomultiplier Tube 9821B with Bialkali Photocathode
Specifications |
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|---|---|
| PMT Type: | PMT (photomutiplier tube) |
| Wavelength Of Max Response: | 350 nm |
| Wavelength Range: | 285 – 630 nm |
| Rise Time: | 2.1 ns |
| Photocathode: | Bialkali |
| Active Diameter: | 67 mm |
| Quantum Efficiency At Peak: | 30 % |
| Weight: | 260 g |
| Maximum Temperature: | 60 ºC |
Features
- High Sensitivity: Bialkali photocathode offers up to 30% peak quantum efficiency.
- Wide Spectral Response: Operates efficiently across 285–630 nm.
- Fast Timing Response: Single electron rise time as fast as 2.1 ns.
- Excellent SER: Peak-to-valley ratio of 2 for high-fidelity detection.
- High Pulsed Linearity: Maintains accurate output under dynamic conditions.
- Multiple Voltage Divider Options: Tailored for different gain and linearity needs.
- Magnetic Field Resilience: Low sensitivity up to 0.4 T in critical orientations.
- Lightweight and Durable: Compact 260 g body with robust design.
Applications
- High-Energy Physics Studies: Accurate photon detection in particle experiments.
- Scintillation Spectroscopy: Ideal for gamma-ray and neutron detection systems.
- Time-Resolved Photon Counting: Fast response for precision light detection.
- Medical and Industrial Imaging: Suitable for use in PET and radiation monitoring systems.
- Nuclear and Environmental Research: Sensitive to low-light emissions and radioactive decay events.
Frequently Asked Questions
The 9821B photomultiplier tube has a diameter of 78mm (3 inches).
The spectral range of the 9821B photomultiplier tube is 285-630 nm.
The 9821B photomultiplier tube is suitable for high energy physics studies and scintillation spectroscopy.
The quantum efficiency of the 9821B photomultiplier tube is 30% at peak.
The maximum rated anode sensitivity of the 9821B photomultiplier tube is 2000 A/lm.