Overview
The Zhenshi Personal Dosimeter is a wearable device for monitoring cumulative and real-time ionizing radiation exposure. It is widely used by radiologists, nuclear plant staff, and industrial workers in high-risk environments. Unlike area monitors, it provides individualized data to ensure compliance with occupational safety limits (e.g., 50 mSv/year for radiation workers). Developed with semiconductor sensors, it offers higher accuracy than traditional film badges. Modern models include Bluetooth connectivity for data transfer and customizable alarm thresholds. Its lightweight design (typically 50-100g) ensures comfort during extended wear.
Structure and Working Principle
The dosimeter consists of a radiation-sensitive semiconductor detector, a microprocessor for data processing, and an LCD display. When ionizing radiation interacts with the sensor, it generates electrical signals proportional to the radiation dose. These are converted into dose equivalents (e.g., Sieverts or Rems) and stored in non-volatile memory. Advanced models feature energy compensation to reduce errors from varying radiation types. The device is powered by rechargeable or replaceable button cells, with low-battery indicators. Some versions include GPS for location tracking in large facilities.
Key Features
Real-time monitoring with audible/visual alarms when exceeding preset limits (e.g., 0.5 μSv/h). Data logging stores months of exposure history, downloadable via USB or wireless interfaces. Water-resistant casings (IP54 or higher) protect against dust and splashes in harsh environments. Energy range typically covers 48 keV to 3 MeV for gamma rays, with ±10% accuracy. Dose rate measurement spans 0.01 μSv/h to 10 mSv/h. Automatic zeroing compensates for background radiation, while tamper-proof designs prevent unauthorized data modification.
Application Areas
Hospitals: For radiologists and CT technicians during fluoroscopy or radiotherapy. Nuclear power plants: Mandatory for maintenance crews near reactors or waste storage. Industrial settings: Used in non-destructive testing (NDT) with X-ray or gamma sources. Research laboratories handling radioactive isotopes also rely on these devices. Some models are MIL-STD compliant for military use in nuclear defense units. The aviation industry employs them for cosmic radiation monitoring at high altitudes.
Maintenance and Precautions
Calibrate annually using traceable radiation sources (e.g., Cs-137) or through accredited service providers. Clean the casing with mild detergent; avoid solvents that may damage displays. Store in low-humidity conditions when not in use to preserve sensor sensitivity. Replace sensors every 3-5 years due to aging effects. Always verify device functionality with test sources before critical operations. For legal compliance, maintain calibration certificates and periodic performance test records.
B2B Procurement Guide
Bulk purchasers (e.g., hospitals, energy firms) should prioritize suppliers with ISO 13485 certification for medical-grade devices. Request full technical documentation including type test reports against IEC 61526 standards. Consider total cost of ownership: calibration services, software licenses, and sensor replacement intervals. For global procurement, ensure the model meets regional regulations like FDA 21 CFR 1020.30 (US) or CE directives (EU). MOQs typically start at 50 units, with 8-12 week lead times for customized configurations. Leasing options are available for short-term projects.
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