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GP-200

END WINDOW GM PROBE

The GP-200 is a very good general purpose detector sensitiveto 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

FEATURES

  • ALPHA, BETA, GAMMA DETECTION
  • RUGGED METAL HOUSING
  • COMPATIBLE WITH ALL JOHNSON
  • RATE METERS

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)