CNCS (China Nuclear Control System)
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| Brand | CNCS (China Nuclear Control System) |
|---|---|
| Model | BH1324F |
| Detector Type | NaI(Tl) Scintillation Spectrometer |
| Energy Range | 50 keV – 2.0 MeV |
| Energy Resolution | ≤7.0% FWHM at 662 keV (with imported low-potassium Φ75×75 mm NaI(Tl) detector) |
| Background Count Rate | ≤160 cpm (50 keV–2.0 MeV) |
| Energy Linearity | ≤±1% (50 keV–2.0 MeV) |
| System Stability | ≤±1% over 8 h |
| MCA Channels | 512 / 1024 / 2048 / 4096 (software-selectable) |
| Max Counts per Channel | 2²⁴−1 |
| Integral Nonlinearity | ≤±0.1% (99.5% full scale) |
| Differential Nonlinearity | ≤±1% (99.5% full scale) |
| Channel Drift | ≤±1 channel over 8 h |
| HV Supply | 0–1500 V, manually adjustable, current limit 2 mA with overload/short-circuit protection |
| LV Supply | Overvoltage, overload and short-circuit protected |
| Preamplifier Gain | 0–160×, fixed shaping time 1 µs (optimized for NaI(Tl)) |
| Shielding | Lead castle (NG401-261), attenuation factor ≥80 (50 keV–2.0 MeV) |
| Software | UMS38 (MCA emulation & acquisition), WIN-NaI (gamma spectral analysis), fully compatible with Windows 98/Me/2000/XP/NT |
| Communication | RS-232 DMA interface, 912 kbps data transfer rate, no ISA slot required |
| Calibration Sources | Certified ²²⁶Ra, ²³²Th, ⁴⁰K single-nuclide standards + mixed standard (NIM traceable) |
| Compliance | ISO 9001 certified manufacturing |
| Detection Limit for Radon (activated charcoal method) | 6 Bq/m³ (average ambient air concentration) |
| 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) |
| Brand | CNCS (China Nuclear Control System) |
|---|---|
| Origin | Beijing, China |
| Model | FH463B |
| Input Impedance | 1 kΩ |
| Input Coupling | AC |
| Pulse Width Range | 0.1 µs – 100 µs |
| Dead Time | ≤200 ns |
| Threshold Range | 0.1 V – 5.0 V (adjustable, linearity deviation ≤±0.5%) |
| Window Width Range | 0.1 V – 3.0 V |
| Polarity | Positive or Negative (input & HV output) |
| Timing Range | K×10ⁿ s (K = 1–9, n = 0–6) |
| Max Count Rate | ≤4.5 MHz |
| Max Count Capacity | 1.5×10⁷ − 1 |
| HV Output Range | ±50 V to ±1500 V (±10 V resolution, stability ≤±0.3% over 8 h after 30-min warm-up) |
| HV Current Limit | ≤600 µA |
| HV Ripple | ≤50 mV RMS |
| HV Temp. Coefficient | ≤±0.05 %/°C |
| Discriminator Temp. Coefficient | ≤±3 mV/°C |
| Low-Voltage Outputs | ±10 V, +5 V |
| Communication Interface | RS-232 (9600 baud, pinout: 3-TXD, 5-GND) |
| Operating Temperature | 5–40 °C |
| Relative Humidity | ≤90% at 30 °C |
| Power Supply | 220 V ±10%, 50 Hz |