The PDP-B series detectors consist primarily of a scintillator, a photomultiplier tube, an electronics module, a Mylar film, a steel mesh and an aluminium housing. The electronics module comprises a flexible combination of voltage divider, high-voltage supply, pre-amplifier and digitiser units.
The scintillator can be configured for single α or single β measurement, or for dual scintillation (α and β). Dimensions can be customised to suit user requirements. The optical structure is generally of the cavity type, though a PMMA light-guiding assembly is also available. The diverse range of output signals ensures the detectors can meet user requirements across a variety of application scenarios.
Specifications:
| Type | Parameters |
| Housing material | Aluminium alloy |
| Detection window | 2 layers of 3-micrometre Mylar |
| Amplifier type | Multi-stage voltage amplification |
| Discrimination method | Voltage discrimination + hardware anti-coincidence |
| Preamplifier output | Tailed pulse or quasi-Gaussian pulse |
| Operating temperature | -25 °C~+50 °C |
| Humidity | <95% |
Typical applications: Portable instrument probes, Hand and foot contamination monitor, Floor contamination detectors, etc.