Radiation Alert® Monitor 200 – Digital Radiation Detector

The Radiation Alert® Monitor 200 from is a compact, professional-grade radiation detector designed for detecting alpha, beta, gamma, and x-ray radiation in laboratory, industrial, emergency response, and field applications. With a rugged handheld design, easy-to-read backlit display, customizable alarms, and USB data logging capability, the Monitor 200 delivers reliable radiation monitoring wherever you need it.

Ideal for radiation safety officers, industrial hygienists, emergency response teams, educational laboratories, and environmental monitoring professionals, the Monitor 200 combines portability with advanced detection performance and user-friendly operation. 

Key Features

• Detects alpha, beta, gamma, and x-ray radiation
• Large backlit LCD display for easy viewing in all lighting conditions
• Displays readings in:
  • CPM (Counts Per Minute)
  • CPS (Counts Per Second)
  • µSv/hr
  • mR/hr
  • Total accumulated counts

• Adjustable audible and visual alarms
• Red LED count indicator flashes with each detected event
• Silent operation mode available
• USB connectivity for data logging and software integration
• Bluetooth® option available for mobile device connectivity
• Internal memory for storing readings and timed counts
• Lightweight and portable design for field or laboratory use
• Long battery life — approximately 800 hours on background radiation
• Compatible with Observer USB Software and Observer BLE App
• Optional NIST calibration available
  

Common Applications

• Radiation safety monitoring
• Nuclear density gauge verification
• Environmental radiation surveys
• Industrial radiography support
• Laboratory radiation detection
• Emergency response and hazmat operations
• Educational and research facilities
• X-ray leakage detection
• Radioactive source location and monitoring
  

Technical Specifications

Detector

• Halogen-quenched Geiger-Mueller tube with thin mica end window
• Effective window diameter: 0.360 in (9.1 mm)
  

Operating Range

• 0.001 to 200 mR/hr
• 0.01 to 2000 µSv/hr
• 0 to 214,000 CPM
• 0 to 3575 CPS
• Total counts up to 9,999,000
  

Sensitivity

• 1070 CPM/mR/hr referenced to Cs-137

Accuracy

• Typically ±15% from factory
• ±10% with optional NIST calibration
  

Display

• Graphic LCD with selectable backlight

Power

• Two AA alkaline batteries or USB power
• Approximate battery life: 800 hours
  

Size & Weight

• Dimensions: 5.5 x 2.7 x 1.3 in.

• Weight: 0.4 lbs (181 g)

Environmental Conditions

• Temperature: 14°F to 122°F (-10°C to +50°C)
• Humidity: 10% to 70% non-condensing
  

Included Accessories

• Protective carrying case
• Rubber protective boot
• Lanyard
• Instrument stand
• Mini-USB cable
• Observer USB Software download
• Certificate of Conformance
• AA batteries
  

Why Choose the Monitor 200?

The Radiation Alert® Monitor 200 offers the ideal combination of portability, sensitivity, and ease of use for professionals who require dependable radiation monitoring in both laboratory and field environments. Its multi-radiation detection capability, customizable alarms, and data logging functionality make it a versatile solution for safety, compliance, and investigative applications.