FEATURES
- ALPHA, BETA, GAMMA DETECTION
- RUGGED METAL HOUSING
- COMPATIBLE WITH ALL JOHNSON
- RATE METERS
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 |
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) |
