FEATURES
- ALPHA, BETA, GAMMA DETECTION
- RUGGED METAL HOUSING
- COMPATIBLE WITH ALL JOHNSON
- RATE METERS
GP-200
END WINDOW GM PROBE
The GP-200 is a very good general purpose detector sensitive to most alpha, beta, and gamma radiation. Measures C-14, SrY-90, Tc-99 and Cs-137. It has a thin end window with 80% open SS screen for contamination and gamma dose monitoring to 200 mR/hr.
| SPECS | GP-200 |
GP-200 SPECIFICATIONS
| General Use | Alpha, Beta, Gamma Detection |
| Detector Type | End Window Halogen-Quenched GM Tube |
| CPM Range | 0-999.9 Kcpm or Kcps |
| Dose Range | 0-200 mR/hr (Cs137) – Requires linearization above 50 mR/hr |
| Window | 1.7 ± 0.3 mg/cm2 mica, protected by a StainlessSteel screen (80% open) |
| Window Area | Active – 6 cm2 (0.93 in2) Open – 5 cm2 (0.78 in2) |
| Efficiency(4π) | C14 – 2%, SrY90 – 10%, Tc99 – 7%, I125– 0.1% |
| Energy Response | Energy Dependent |
| Sensitivity (Cs137 gamma) | ≈ 2100 cpm/mR/hr |
| Operating Voltage | 900 vdc |
| Dead Time | 200 µsec |
| Normal Background | ≈40 cpm |
| Environmental | -20°F[-28°C] to 140°F[60°C] 5-95% RH |
| Connector | BNC (other types available) |
| Dimensions | 1.2″ (3cm) Dia x 5″ (12.5cm) L |
| Weight | 8 oz (0.23 kg) |
