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​Ludlum Ion Chamber Radiation Meters


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Model 9DP
Ludlum Part Number: 48-3742
Pressurized Ion Chamber (117 PSI)
0-5 R/hr Range with µR/hr Sensitivity
Gamma/X-rays >25 keV; Beta >1 MeV
Rate, Integrate and Peak Hold Readouts
Auto Zeroing/Ranging, Alarming Capability
Sunlight Readable Color Display
Rechargeable Batteries
Data Logging, USB Connectivity
​Free Firmware Updates through Internet
Optional Dimension Interface Kit P/N 4293-763
Data Sheet
Product Manual​
Model 9DP Response Curve
Model 9DP Logging Software Instructions​
​Model 9DP Full Instrument Overview (YouTube)
Model 9DP  Control Panel Overview (YouTube)​
How to Decompress Model 9DP (YouTube)
​Exception for Transport as Material of Trade

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Model 9DP-1
Ludlum Part Number: 48-3899
Pressurized Ion Chamber (25 PSI)
Low Pressure Chamber is Non Hazmat
Special Design for Radiography Pulsed Fields
0-50 R/hr Range
Gamma/X-rays >25 keV; Beta >1 MeV
Rate, Integrate and Peak Hold Readouts
Auto Zeroing/Ranging, Alarming Capability
Sunlight Readable Color Display
​​Rechargeable Batteries
​Data Logging, USB Connectivity
Free Firmware Updates through Internet
Optional Dimension Interface Kit P/N 4293-763
Data Sheet
Product Manual
Response Curve
Model 9DP Full Instrument Overview (YouTube)
Model 9DP  Control Panel Overview (YouTube)​
How to Decompress Model 9DP (YouTube)

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Model 9-3
Ludlum Part Number: 48-3633
Air Ionization Chamber
Beta, Gamma Radiation Dose Rate
5 Ranges from Background to 50 R/hr
1000 mg/cm² Retractable Beta Shield
Temperature Compensated
Proportional Audio Output
High Background Zero Capability
​Download Model 9-3/RO-20 Comparison Chart
Data Sheet
Product Manual​
Altitude Dependence Chart

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Model 9-4
Ludlum Part Number: 48-3739
Air Ionization Chamber
Beta, Gamma Radiation Dose Rate
5 Ranges from 0-50 R/hr
1000 mg/cm² Retractable Beta Shield
Temperature and Pressure Compensated
​PC Controlled Calibration
High-Background Zero Capability
Data Sheet
Product Manual
Control Software Manual

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Model 9-7
Ludlum Part Number: 48-3689
High Range Ion Chamber
High Range Beta, Gamma Dose Rate
0-19.99 kR/hr Range, Digital Readout
Direct Replacement for Eberline Model RO-7
Adapts to Existing Eberline RO-7 Detectors
Several Improvements over Eberline RO-7
​Available Detectors (sold separately): 
  * Model 9-7-LD Low Range (0.001–1.99 R/hr)
   * Model 9-7-BM Medium Range (0.1–199.9 R/hr)
   * Model 9-7-BH High Range (0.01–19.99 kR/hr)

Data Sheet
Product Manual
Model 9-7 Detectors Data Sheet


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Radiation Safety & Protection, LLC
6555 Sugarloaf Parkway  Suite 307-333  Duluth, GA 30097
Phone: (770) 363-0925  Email:  [email protected]

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