1. Product Overview
The FNIRSI GC-01 is a portable nuclear radiation detector designed to measure the intensity of ionizing radiation, including beta particles, gamma rays, and X-rays. It utilizes a high-precision Geiger-Müller counter tube to provide accurate readings for personal dosimetry and environmental monitoring. This device is suitable for detecting radiation in various environments, including industrial settings, food, metal, ceramic tiles, and marble.
Key Features
- High-precision Geiger-Müller counter for accurate detection.
- Detects beta particles, gamma rays, and X-rays.
- Adjustable alarm thresholds with sound, glitter (visual), and vibrate modes.
- Real-time, average, and cumulative dose equivalent rate display.
- Built-in 1100mAh lithium battery for extended operation.

2. Safety Information
Always handle the device with care. Do not attempt to open or modify the device, as this may compromise its accuracy and safety features. Keep the device away from extreme temperatures, moisture, and strong electromagnetic fields. This device is intended for informational purposes and should not be used as the sole basis for critical safety decisions without professional consultation.

3. Package Contents
Verify that all items are present in the package upon unboxing:
- FNIRSI GC-01 Nuclear Radiation Detector
- Type-C Charging Cable
- User Manual

4. Device Layout
The FNIRSI GC-01 features a clear display screen and intuitive button controls for easy operation. The main screen displays real-time radiation readings, average values, and cumulative dose. Navigation buttons allow access to settings and different measurement modes.

5. Setup
5.1 Charging the Device
Before first use, fully charge the device using the provided Type-C charging cable. Connect the cable to the device's charging port and a standard USB power adapter (not included). The charging indicator on the screen will show the charging status.
5.2 Powering On/Off
- To Power On: Press and hold the power button (usually the 'OK' button) until the screen illuminates.
- To Power Off: Press and hold the power button until the device shuts down.
5.3 Initial Settings
Upon first power-on or after a factory reset, you may need to configure basic settings:
- Navigate to the 'Settings' menu using the navigation buttons.
- Select 'Language' to choose your preferred language (e.g., English).
- Select 'Unit' to set the desired measurement unit (e.g., uSv/h, mR/h).
- Adjust the 'System Clock' to ensure accurate timekeeping for data logging.
6. Operating Instructions
6.1 Measurement Modes
The device typically operates in a continuous measurement mode, displaying:
- Current Dose Rate: Real-time radiation level.
- Average Dose Rate: Average radiation level over a period.
- Cumulative Dose: Total accumulated radiation dose since the last reset.
The device automatically detects beta, gamma, and X-rays. Its GM Geiger Counter Tube offers high precision for accurate readings.

6.2 Setting Alarm Values
To set a custom alarm threshold:
- Access the 'Set Alarm' option in the menu.
- Use the navigation buttons to adjust the 'Current Alarm' value (dose rate threshold).
- Adjust the 'Cumulative Alarm' value (total dose threshold) if desired.
- Confirm your settings. The device will trigger an alarm if the measured radiation exceeds these set values.
6.3 Alarm Modes
The FNIRSI GC-01 offers three distinct alarm modes:
- Sound: An audible alert will be emitted.
- Glitter: The screen will flash or a visual indicator will activate.
- Vibrate: The device will vibrate to alert the user.
These modes can be configured in the 'Ala Mode' setting within the menu.
7. Maintenance
7.1 Cleaning
Wipe the device with a soft, dry cloth. Do not use abrasive cleaners, solvents, or immerse the device in water. Ensure the charging port is free from dust and debris.
7.2 Storage
Store the device in a cool, dry place away from direct sunlight and extreme temperatures. If storing for an extended period, ensure the battery is partially charged (around 50%) to prolong its lifespan.
7.3 Battery Care
To maintain battery health, avoid fully discharging the device frequently. Recharge the battery when the low battery indicator appears. Use only the provided Type-C cable for charging.
8. Troubleshooting
8.1 Device Does Not Power On
- Ensure the battery is charged. Connect the device to a power source using the Type-C cable and try again.
- Press and hold the power button for at least 5 seconds.
8.2 Inaccurate Readings
- Ensure the device is not near strong electromagnetic interference sources.
- Verify that the measurement unit is correctly set in the device settings.
- If readings are consistently abnormal, contact customer support.
8.3 Alarm Not Functioning
- Check the 'Set Alarm' values to ensure they are configured correctly and are not too high.
- Verify that the desired 'Ala Mode' (Sound, Glitter, Vibrate) is enabled in the settings.
9. Specifications
| Parameter | Value |
|---|---|
| Types of Detection Rays | Gamma rays, X-rays, Beta rays |
| Detector | Energy Compensation GM Tube (Geiger Tech no logy Tube) |
| Dose Equivalent Rate | 0.00-100000 μSv/h (10mSv/h) |
| Cumulative Dose Equivalent | 0.00 μSv-500.0mSv |
| Energy Range | 48keV-1.5MeV ±30% (for 137CS-) |
| Language | Chinese/English switch |
| Sensitivity | 80CPM/pSv (For Co-60) |
| Dosage Unit | nSv/h, pSv/h, mR/h, cps, cpm Switch |
| Power Supply | 1100mAh lithium battery |
| Alarm Method | Light, vibration, sound |
| Product Dimensions (L x W x H) | 120 x 78 x 27 mm |
| Product Weight | 500 grams |
| Measurement Precision | ±0.1% |
| Certifications | RoHS, CE |
| Material | Acrylonitrile Butadiene Styrene |
10. Warranty and Support
The manufacturer provides a commitment to spare parts availability for 5 years from the date of purchase. For technical support, warranty claims, or service inquiries, please refer to the contact information provided with your purchase documentation or visit the official YuqiaoTime website.





