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| Brand | CNCS (China Nuclear Control System) |
|---|---|
| Origin | Beijing, China |
| Model | FD125 |
| Detection Principle | ZnS(Ag)-based Scintillation Counting |
| Measurement Targets | Radon-222 (²²²Rn), Thoron-220 (²²⁰Rn), and Radium-226 (²²⁶Ra) in air, water, ore, and underground environments |
| Scintillation Chamber | Dual hemispherical acrylic chambers coated with ZnS(Ag) |
| Background Count Rate | ≤100 cps (unexposed chamber) |
| Leak Rate | ≤1.33×10³ Pa/10 min at residual pressure of 1.33×10⁴ Pa |
| Repeatability Error | ≤±10% under optimal conditions |
| Environmental Operating Range | 0–45°C, up to 95% RH |
| Power Supply | +9–10 V DC for amplifier |
| Weight | 16 kg (excluding scaler unit) |
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