FJ-310A Gamma Radiation Measuring Instrument with Dual GM Counter Tube for X, γ, β Radiation and 0.01μSv/h ~ 1Sv/h Range
The FJ-310A (GM) Protection Level X and γ radiation measuring instrument is designed for accurate and rapid measurement of X, γ, and β radiation. This portable, easy-to-operate instrument features dual GM counter tubes with automatic high/low range switching, ensuring reliable alarm functionality even when personnel encounter large radiation doses.
Applications include environmental background condition detection by environmental protection departments, radiation monitoring near medical X-ray equipment, non-destructive testing equipment radiation leakage detection, and environmental background measurement near nuclear power plants. The instrument complies with HJ 1157-2021 "Technical Specification for Measurement of Environmental Gamma Radiation Dose Rate".
| Radiation Type | X, γ |
| Probe | Dual GM counter tube |
| Measurement Unit | μSv/Sv (switchable) |
| Measuring Range | 0.01 μSv/h ~ 1 Sv/h |
| Sensitivity | ≥3000 CPM |
| Range Switching | Automatic high/low range switching |
| Cumulative Dose | 1000K |
| Energy Response | 30keV ~ 4MeV, ±20% |
| Energy Response Error | ≤±15% |
| Dose Equivalent Error | ≤±30% |
| Angular Response | ≤±15% (0 ~ 180°) |
| Relative Inherent Error | ≤±10% (137Cs) |
| Repeatability | ≤1% |
| Fluctuation Error | ≤1% |
| Power Supply | Four 1.5V batteries |
| Power Rate | 350mW |
| Dimensions | 200mm × 130mm × 100mm (L×H×W) |
| Operating Temperature | -10℃ ~ +50℃ |
| Humidity | RH95% (35℃) |
| Weight | 1000g |
- Customizable alarm threshold with audible and visual alerts when exceeded
- Manager calibration capability through scale factor modification
- Large screen display with backlight and manual switch control
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