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800-620-8803 
WMB Johnson Model – GM “Pancake” Probe – HP 265
(GSM -110 meter sold separately)
The HP-265, commonly known as the “Pancake” probe, has become the most popular detector for the general measurement of Alpha, Beta, and Gamma measurements. Built inside a ruggedized housing, this detector is the best general detector for most types of measurement applications.
OVERVIEW
SPECIFICATIONS
| General | The best “all-purpose” detector. Sensitive to most Alpha, Beta, and Gamma Radiation |
| Compatibility | Compatible with all WB Johnson Instruments and Area Monitors (Additional Manufacturer compatibility upon request) |
| Range | 0-200 mR/hr Dose (Cs-137) Requires linearization above 50 mR/hr |
| Energy Response | Alpha – 3.5 meV min, Beta – 1 keV min, Gamma – 20 keV-2 meV |
| Operating Voltage | 900vdc |
| Window Density | 1.6 mg/cm3 |
| Dead Time | 20 uSec |
| Sensitivity (Cs-137) | 3300 CMP/mR/hr |
| Sensitive Area | 15 cm2 |
| Environmental | -20°F (-28°C) – 140°F (60°C) | 5-95% RH |
| Circuitry | 100% Digital Microprocessor Controlled |
| Dimensions | 2.74″ (7cm) Dia x 5.511″ (28cm) L |
| Weight | 1lbs. (.5Kiles) |
| Construction | Cast Aluminum & Stainless Steel |
