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Beta/Gamma Detectors
Model 44-6
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Ludlum Part Number: 47-1535
  • Beta, Gamma Radiation Survey
  • Halogen Quenched GM Radiation Detector with Rotary Beta Window
  • Used with Ludlum General Purpose Radiation Survey Meters, Ratemeters, Scalers
  • Sensitivity (Cs-137): 1200 cpm/µR/hr
  • Energy Response: Energy Dependent
  • ​Background: 20 cpm Closed; 25 cpm Open
  • Efficiency (Closed): 17% Co-60; 0.35% Cs-137
  • Efficiency (Open): 19% Co-60; 0.50% Cs-137
Data Sheet                Product Manual               Detector Clips
Model 44-21
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Ludlum Part Number: 47-1560
  • Beta, Low-Energy Gamma Radiation Survey
  • 1 in. x 1 mm NaI(Tl) Scintillation Detector
  • Used with Ludlum General Purpose Radiation Survey Meters, Ratemeters, Scalers
  • Energy Response: Energy Dependent
  • Background: 450 cpm
  • ​Efficiency (4π): 38% I-125; 19% I-129; 4% C-14; 28% P-32
  • Efficiency (Open): 19% Co-60; 0.50% Cs-137
  • Window Active/Open Area: 5.1 cm²
Data Sheet                 Product Manual
Model 44-38
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Ludlum Part Number: 47-1588
  • Beta, Gamma Radiation Survey
  • Halogen Quenched GM Radiation Detector
  • ​Detection Range: ± 10% up to 50 mR/hr without DTC; up to 500 mR/hr with DTC
  • Used with Ludlum General Purpose Radiation Survey Meters, Ratemeters, Scaler
  • Gamma Energy Response: Within 20% from 60 keV to 1.3 MeV (Cs-137)
  • ​​Sensitivity: 1200 cpm/mR/h
  • Beta Cutoff: approximately 200 keV
  • Sensitivity: 1200 cpm/mR/hr
  • Background: 20 cpm closed; 25 cpm open
Data Sheet                Product Manual                 Detector Clips
Model 44-92
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​​Ludlum Part Number: 47-2362
  • Low-Level Beta, Gamma Radiation Survey
  • Sealed Xenon Gas Proportional Detector
  • Used with Some Ludlum General Purpose Radiation Survey Meters, Ratemeters, Scalers
  • Sensitivity (Co-60): 36,000 cpm/mR/hr
  • Window Active Area: 169 cm²
  • ​Window Open Area: 140 cm²
  • Efficiency (4π): 10% C-14; 13% Tc-99; 24% Cl-36; 26% Sr-90/Y-90; 3% I-129; 1.6% Co-57; 1.2% Fe-55; 10% Pu-239
Data Sheet                 Product Manual
Model 44-98
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Ludlum Part Number: 47-2465
  • Beta, Low-Energy Gamma Radiation Survey
  • 1 in. x 1 mm Bismuth Germinate (BGO) Scintillation Radiation Detector
  • Used with Some Ludlum General Purpose Radiation Survey Meters, Ratemeters, Scalers
  • Energy Response: Energy Dependent
  • Background: 650 cpm 
  • Efficiency (4π): 15% I-125; 85 I-129; 3% C-14
  • Window Active/Open Area: 5 cm²
Data Sheet                 Product Manual
Model 44-172
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Ludlum Part Number: 47-3543
  • Beta; Low-Energy Gamma Radiation Survey
  • 1 in. x 1 mm Yttrium Oxyorthosilicate (YSO) Scintillation Radiation Detector
  • Used with Ludlum Meters with 00-1200 Vdc and 35 mV input sensitivity
  • Energy Response: Energy Dependent
  • Background: 250 cpm or less
  • Efficiency (4π): 40% I-125; 25% I-129; 8% C-14; 7% Fe-55; 2.5% Cs-137; 11.7% Am-241; 7.4% Co-57
  • Window Active/Open Area: 5 cm²
Data Sheet                Product Manual
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  • Home
  • Products
    • Ludlum Products >
      • Air Monitors
      • Area Monitors >
        • Area Monitors
        • Area Monitor Accessories
        • Area Monitor Controllers
      • Contamination Monitors >
        • Hand and Foot Monitors
        • Portal Radiation Monitors
        • Surface Area Monitors
        • Laundry Monitors
        • Small Area Monitors
      • Emergency Response >
        • Emergency Response Kits >
          • General Emergency Response Kits
          • Medical Emergency Response Kits
          • Decontamination Kits
        • Friskers
        • Emergency Portal Monitors
        • Personal Dosimeters
      • Medical Physics >
        • CT/MRI Phantoms
        • Diagnostic Test Tools
        • Mammography Test Tools
        • Nuclear Medicine
        • Radiation Safety
        • Shielding
        • Ultrasound Phantoms
      • Metal Recycling >
        • Area Monitors
        • Conveyor/Soil Monitors
        • microR Meters
        • Scrap Monitors
        • Slug Sample Monitors
      • Radiation Detectors >
        • Alpha
        • Beta
        • Gamma >
          • Scintillation Detectors
          • GM Detectors
        • Neutron
        • Alpha/Beta
        • Alpha/Beta/Gamma
        • Beta/Gamma
        • Accessories
      • Radiation Meters >
        • General Purpose Meters >
          • Digital
          • Analog
        • Benchtop Meters
        • Data Logging Meters
        • Friskers
        • Geiger Counters
        • Intrinsically Safe Meters
        • Ion Chambers
        • Large Area/Outdoor Monitors
        • microR Meters
        • Multi Detector Meters
        • Neutron Meters
        • Personal Dosimeters
        • Pocket Meters
        • Pulse Generators
        • Radiography Meters
        • Scaler/Ratemeters
        • Telescoping Meters
        • Meter Accessories
      • Sample Counters >
        • Gamma Counters
        • Counter Electronics
        • Counter Heads
        • Sample Holders
        • Sample Planchets
      • Waste Monitors
      • Catalogs and Price List
  • Contact