The **PCE-RDM 5** is a professional-grade radiation monitor (Geiger counter) designed to measure Gamma ($\gamma$), Beta ($\beta$), and X-ray radiation. Its internal electronic architecture is optimized for high sensitivity and real-time data processing. --- ### Core Electronic Components The device consists of several critical subsystems that convert ionizing radiation into readable digital data. | Component | Function | Technical Detail | | :--- | :--- | :--- | | **GM Tube** | Radiation Sensing | Uses a halogen-quenched Geiger-Müller tube as the primary transducer. | | **High Voltage Module** | Tube Energizing | Boosts battery voltage to ~400V - 600V required for the GM tube to operate. | | **Microcontroller (MCU)** | Logic & Processing | A low-power 32-bit RISC processor that counts pulses and calculates dose rates. | | **TFT Color Display** | User Interface | A high-resolution screen (usually 2.4") for displaying graphs and instantaneous values. | | **Li-ion Battery** | Power Supply | Typically a 1100mAh to 1200mAh rechargeable cell managed by a charging IC. | --- ### Signal Processing Workflow The electronics follow a specific chain of command to ensure accuracy: 1. **Detection:** A radioactive particle enters the GM tube, causing gas ionization. 2. **Pulse Generation:** A momentary electrical current (pulse) is created. 3. **Pulse Shaping:** The internal circuitry filters noise and "shapes" the pulse into a clean square wave for the MCU. 4. **Conversion:** The MCU applies a conversion factor (based on the tube's sensitivity) to turn "Counts Per Minute" (CPM) into **$\mu$Sv/h** or **mR/h**. 5. **Storage:** Data is logged into the internal flash memory for historical analysis. ### Key Electronic Features * **Alarm System:** Features both an integrated **piezoelectric buzzer** and a **vibration motor** for dual-mode alerts when thresholds are exceeded. * **USB-C Interface:** Handles both DC 5V charging and data transmission to a PC for software analysis. * **Protection Circuitry:** Includes over-voltage and over-current protection to prevent damage to the sensitive GM tube during charging or high-intensity exposure. --- ### Technical Specifications Summary | Parameter | Value / Range | | :--- | :--- | | **Dose Rate Range** | 0.05 $\mu$Sv/h - 50 mSv/h | | **Energy Sensitivity** | 0.01 $\mu$Sv/h | | **Charging Port** | USB Type-C | | **Sensor Life** | Approx. 10,000 hours (depending on exposure) |