Fixed Location Radiation Detector: The Complete Facility Solution — CESTSEN GM-R200
When a single radiation event goes undetected in a hospital corridor, a customs inspection hall, or an industrial NDT room, the consequences can be severe — for personnel health, regulatory compliance, and institutional liability alike.
A fixed location radiation detector solves this by providing continuous, automated, 24/7 radiation monitoring at every critical point in your facility — without relying on staff to remember to carry a portable device.
The CESTSEN GM-R200 Online Radiation Monitoring System is built for exactly this purpose.

What Is a Fixed Location Radiation Detector?
Unlike handheld Geiger counters used for spot-checks, a fixed location radiation detector is permanently installed at a specific position — a doorway, a room, a corridor, or a piece of equipment — and continuously monitors radiation levels in real time.
Key advantages over portable instruments include:

•Continuous monitoring — no gaps in coverage between manual checks
•Automated alarms — immediate response without human intervention
•Data logging — complete historical record for regulatory audits
•System integration — connects to building management systems, cloud platforms, and control rooms
•Multi-point coverage — one host controller manages multiple sensor locations simultaneously

Introducing the CESTSEN GM-R200 Radiation Monitoring System
The GM-R200 is a Geiger-Müller tube based online radiation monitoring system developed by Shenzhen WanYi Technology (ONETEST Technology). Its architecture separates the intelligent display host from the distributed sensor probes — allowing a single system to monitor radiation across an entire facility floor, building wing, or multi-room complex.

GM-R200 Core Technical Specifications

Flexible Sensor Probe Selection
The GM-R200's most powerful feature is its modular sensor architecture. The monitoring host connects to any combination of CESTSEN RAD-S series sensor probes, each optimized for different detection requirements:

This flexibility means a single GM-R200 host can simultaneously monitor a CT room with one probe type, a nuclear medicine prep area with another, and a radioactive waste storage room with a third — all on one unified system.

3Reasons Facilities Choose the GM-R200
① One Host, Up to 25 Monitoring Points
The GM-R200 standard configuration supports up to 25 sensor probes on a single host unit — covering an entire hospital floor, industrial facility, or customs inspection complex from one central controller. This dramatically reduces infrastructure cost compared to deploying individual standalone monitors at each location.
② 7-Inch Touch LCD — Clear Real-Time Visibility
The large 7-inch touch screen display shows real-time dose rate readings, alarm status, and historical trend data for all connected probes simultaneously. No dedicated PC workstation required for on-site monitoring.
③ RS485 + 4G Dual Output — Integrate Anywhere
Standard RS485 Modbus-RTU output integrates with hospital BMS, SCADA systems, PLCs, and custom control platforms. The optional 4G wireless module enables remote monitoring via ONETEST's cloud platform — accessible from any computer, tablet, or smartphone.

Typical Installation Scenarios
Hospitals and Medical Centers
Monitor X-ray rooms, CT suites, nuclear medicine departments, gamma knife therapy rooms, and radioactive waste storage simultaneously — with centralized alarm management from a single host at the radiation safety office.
Industrial NDT Facilities
Deploy probes at the perimeter of radiography bays and adjacent work areas to verify that radiation levels during exposure operations comply with controlled area boundaries.
Customs and Port Inspection
Install probes at operator workstations beside cargo X-ray scanners and vehicle inspection portals to continuously document that staff radiation exposure remains within occupational limits.
Nuclear Medicine and Radiopharmacy
Monitor isotope preparation rooms, patient injection areas, and decay storage rooms — with automatic alarms if any zone exceeds facility-specific dose rate thresholds.
Research Institutions
Provide continuous area monitoring across multi-room laboratory complexes handling sealed and open radioactive sources, with full data logging for radiation protection audit trails.