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PPA-2T

SHIELDED ALPHA-BETA-GAMMA PROBE

The shielded PPA-2 detector is the optimal detector for contamination Monitoring and sample counting. A thick tungsten shield produces a very low background, optimizing detection sensitivity.

SPECS PPA-2T
Category:

FEATURES

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

PPA-2T SPECIFICATIONS

General Use Alpha, Beta, Gamma Surveying and Sample Counting
Detector Type Halogen-Quenched GM Pancake Tube
Shield Material Tungsten (Stainless Steel Optional)
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 (79% open)
Window Area Active – 15.5 cm2 (2.4 in2)
Open – 12.3 cm2 (1.9 in2)
Efficiency(4π) C14 – 5%, SrY90 – 22%, Tc99 – 19%, P32- 32%
Energy Response Energy Dependent
Sensitivity (Cs137 gamma) ≈ 3300 cpm/mR/hr
Operating Voltage 900 vdc
Dead Time 80 µsec
Normal Background ≈25 cpm
Environmental -20°F[-28°C] to 140°F[60°C] 5-95% RH
Connector BNC (other types available)
Dimensions 4″ (10cm) dia x 4″ (10 cm) H
Weight 4 lbs (1.36 kg)