Overview
The GP Series Geiger Mueller Detectors are rugged, halogen-quenched GM tubes designed for wide-range gamma radiation measurement. They utilize the patented Canberra Time-to-Count technique, which eliminates the limitations of conventional GM tubes, such as dead time and saturation effects. These detectors are SMART probes, storing calibration data in non-volatile memory, allowing for interchangeability and maintenance-free operation.

Key Features

• Patented Time-to-Count technique for improved accuracy and linearity.
• SMART Probe technology with non-volatile memory for calibration data.
• Interchangeable detectors with no operator adjustments required.
• Calibration cycles extend up to two years.
• Optional mounting brackets and connection to Canberra's area monitor and display units.

Principle of Operation
The GP Series uses a pair of halogen-quenched GM tubes for gamma radiation detection. The Time-to-Count technique involves rapidly increasing the bias voltage to 500 V dc, counting time cycles until a GM tube pulse is obtained, and then reducing the voltage to allow the tube to recover. This method ensures full-size pulses and a statistically reliable average time-to-count, providing linear performance across a wide range.

Specifications

• Detector Type: Halogen Quenched GM Tubes.
• Resolving Time: 1 µs.
• Operating Voltage: 450–550 V dc.
• Dynamic Range: 9 decades.
• Energy Range: 80 keV to 3.0 MeV.
• Linearity: ±5%.
• Operating Temperature: –30 °C to +50 °C.
• Power: +5 V dc.

Models and Applications

• GP100, GP100SI, GP100C, GP100CS, GP100M, GP100MS, GP110, GP110SI.
• Applications include area monitoring and environmental radiation detection.

Quality and Compliance
The GP Series detectors are manufactured under a quality system compliant with ISO 9001, 10CFR21, 10CFR50, Appendix “B”, IEEE-730, and ANSI/ASME NQA standards.

Contact Information
For international inquiries, contact details for various regions are provided, or visit the Canberra website.