With the upgrading of policies and regulations, radiation monitoring has become a rigid demand for the construction of nuclear medicine disciplines
China's nuclear medicine will experience explosive growth in 2025. Driven by the national policy of " full coverage of nuclear medicine departments in tertiary general hospitals ", medical institutions across the country are accelerating the deployment of high-end nuclear medicine equipment such as PET/CT.
In this construction wave , radiation monitoring and protection capabilities have become core indicators for department acceptance and daily operations.
The newly released "Guidelines for the Construction of Radiation Diagnosis and Treatment Facilities in Medical Institutions" clearly requires that nuclear medicine work areas must implement zoned real-time radiation monitoring , install automatic radioactive contamination detection devices at entrances and exits , and ensure that detection data can be checked online.
Henan Province’s new regulations for 2025 are more specific: All areas where radioactive drugs are handled must be equipped with a dual-detector contamination monitoring system with automatic background calibration function , and the false alarm rate must be controlled below 0.1% .
In the issuance of radiation safety licenses in Anhui, Sichuan and other places, the regulatory authorities particularly emphasized the installation of real-time dose alarm systems , requiring that when the radiation level exceeds the preset threshold, the system must trigger an audible and visual alarm within 1 second and start interlock control.
These technical requirements are driving radiation monitoring equipment from "optional accessories" to " standard equipment in nuclear medicine departments ", and also indicate that professional and intelligent radiation monitoring solutions have become a core requirement for the construction of modern nuclear medicine departments.
Three core monitoring scenarios for PET-CT radiation protection
Site radiation monitoring: from static protection to dynamic perception
Radiation safety in modern PET-CT departments no longer relies solely on physical shielding, but also requires the establishment of a full-time monitoring network . According to the latest standards, three types of monitoring equipment must be deployed:
Regional Radiation Monitor : Fixed continuous monitoring probes need to be installed at key locations such as medication rooms, scanning rooms, and waiting areas to track changes in gamma-ray doses in real time.
The Shanghai Renji RJ21-1108 device uses a GM tube detector with a range of 0.1μSv/h~1Sv/h, which can identify radiation anomalies and trigger alarms. One host can be expanded to connect multiple probes to build a complete department monitoring network.
Exhaust emission monitoring : In view of the risk of radioactive aerosols, the ventilation system needs to be equipped with an activated carbon filtration efficiency monitoring module . The latest regulations require that the filtration device must contain 16 layers of activated carbon barrels , the exhaust volume must be ≥3000m³/h, and a differential pressure sensor must be used to monitor the filtration efficiency in real time.
Shanghai Renji provides matching pipeline radiation sensors that can monitor the radioactive activity of exhaust gases online to ensure compliance with national emission standards.
Waste treatment monitoring : Water-immersed detectors must be installed in decay pools and solid waste storage areas . The protection level must reach IP68 and can withstand high humidity and corrosive environments. This type of equipment can record the entire decay process of radioactive wastewater to prevent insufficiently decayed waste liquid from entering the municipal pipe network.
Shanghai Renji RJ12 equipment uses a large volume scintillation crystal detector
The sensitivity to Cs-137 nuclides is up to 2000cps/(μSv/h) . When contamination is detected, the system automatically sounds an audible and visual alarm and records the personnel ID to prevent the spread of contamination.
Shanghai Renji RJ31-1305 adopts GM detector design , which can display the cumulative dose in real time and automatically warn when approaching the annual dose limit.
Equipment operation monitoring: from single-machine detection to system linkage
The radiation safety of modern PET-CT equipment requires the establishment of a multi-level joint control mechanism:
Scanning room door interlock : using radiation sensing + mechanical interlocking technology, when the detector detects that the indoor radiation level exceeds the standard, it automatically locks the protective door opening mechanism to prevent accidental entry.
Emergency interruption system : Emergency stop switches visible from multiple locations are set up in the computer room, which are linked to the Shanghai Renji RJ21 system. Once triggered, the scan will be terminated immediately and the exhaust will be started.
Drug packaging monitoring : Install a fume hood radiation sensor in the radioactive drug operation area , requiring the negative pressure wind speed in the cabinet to be ≥0.5m/s and the wind speed at the hand hole to be ≥1.2m/s to ensure zero aerosol leakage.
Shanghai Renji Radiation Monitoring Product Matrix
Shanghai Renji provides four categories of professional monitoring equipment for all scenarios of PET-CT departments:
Technical analysis of key products:
The system host is equipped with a 10.1-inch LCD display, which can display the real-time dose rate of 6 probes at the same time. When the detection value exceeds the preset threshold, it triggers an 85-decibel sound and light alarm and outputs a switch signal, which can interlock and control protective doors, exhaust systems and other equipment.
2. Pedestrian Monitoring Door RJ12-2030
The innovative self-calibration algorithm reduces the false alarm rate to below 0.05% by continuously monitoring the environmental background and automatically adjusting the reference point. The system is equipped with an infrared speed measurement module, which can accurately record the time when people pass through and the length of time they stay, providing data support for pollution tracing. The detection data is uploaded to the cloud platform in real time via 4G/WiFi.
The handheld device integrates dual detection technology: the plastic scintillator detector (20keV-7MeV) is responsible for high-sensitivity monitoring; the GM tube detector (60keV-3MeV) ensures accuracy at high ranges. Equipped with a 2.4-inch touch screen, it can store 4,000 alarm records, making it particularly suitable for equipment QA testing and emergency troubleshooting.
Post time: Jul-22-2025