CNC (China Nuclear Control System)
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| Brand | CNC (China Nuclear Control System) |
|---|---|
| Origin | Beijing, China |
| Model | BH1216III |
| Instrument Type | Laboratory-grade dual-channel liquid alpha/beta spectrometer |
| Detector Type | Plastic scintillator (ST-1221 main |
| Measurement Medium | Aqueous samples |
| Detection Efficiency | α ≥88% (²³⁹Pu, 2π geometry, Φ30 mm), β ≥55% (⁹⁰Sr–⁹⁰Y, 2π, Φ20 mm) |
| Background Count Rate | α ≤0.005 cm⁻²·min⁻¹, β ≤0.15 cm⁻²·min⁻¹ |
| Minimum Detectable Activity | α = 5×10⁻³ Bq, β = 1×10⁻² Bq |
| Anti-coincidence Efficiency | >99% |
| Shielding | 100 mm lead + 10 mm steel (total mass ≈500 kg) |
| Operating Temperature | 5–35 °C ±2 °C |
| Humidity | ≤85% RH at 30 °C |
| Dimensions | 605 × 541 × 1244 mm |
| Weight | ~500 kg |
| Compliance | Meets GB/T 11682–2021 (Chinese National Standard for Low-Background Alpha/Beta Counters, Level II) |
| Brand | CNC (China Nuclear Control System) |
|---|---|
| Origin | Beijing, China |
| Model | FJ427A1 |
| Instrument Type | Laboratory TLD Reader |
| Measurement Principle | Thermoluminescence (TL) Readout |
| Radiation Types | β, γ, X-ray, and thermal neutron (via appropriate TLD phosphors) |
| Detector | Photomultiplier Tube (PMT), operating voltage range: −400 V to −1000 V |
| Sample Form Compatibility | Solid dosimeters (square chips, discs, rods, powder) |
| Dose Range | 0.000–9999 arbitrary units (calibrated in µGy–Gy via TL phosphor-specific calibration) |
| Linearity Range | 100 µGy – 4 Gy (for JR1152A LiF:Mg,Ti chips irradiated with ⁶⁰Co γ-rays) |
| Linearity Deviation | ≤ ±10% within specified range |
| Heating Program | Three-stage linear ramp (preheat, readout, anneal) |
| max total duration | 500 s |
| preheat | RT → 500 °C at max rate |
| readout | variable ramp 0–40 °C/s, temp range up to 500 °C |
| anneal | ramp to 500 °C at max rate |
| Programmable Parameters | 5 independent parameter sets (including ramp profile, PMT HV, background offset, reference light source count rate, calibration factor, real-time clock) |
| Background Subtraction | Automatic, performed every 30 min during operation |
| Sensitivity Stability | ≤ ±5% over 8-h continuous operation |
| Compliance | Designed per GB 10264–1988 (Chinese National Standard for Thermoluminescent Dosimetry Systems) |
| Physical Dimensions | 445 mm (W) × 205 mm (D) × 420 mm (H) |
| Net Weight | 22 kg |
| Power Supply | AC 220 V, 50 Hz |