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​Ludlum Neutron Radiation Meters


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Model 30-7B
Ludlum Part Number: 48-4309
Neutron Radiation Dose Rate Meter
Lightweight - Under 10 lb
Multi-Function Digital Display Unit
Low-Weight Device Substitutes for Ratemeter
Simple Switching Between Two Sets of Units
​Low-Weight Unit Provides Same Readings as Standard REM-ball
​​​Includes Adjustable Shoulder Strap
Display Unit Detaches for Greater Versatility​
7 in. Moderated H-3 Proportional Detector​
0 to 10,000 mrem/hr Range
Gamma Rejection up to 10 R/hr
Data Sheet
Product Manual (Model 30)
Model 42-49B Neutron Detector Manual​
Model 30-7B White Paper

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Model 12-4-7
​Ludlum Part Number: 48-4280
Neutron Radiation Dose Rate Meter
Smaller, Lighter 7-inch Polyethylene Ball
7 in. Moderated H-3 Proportional Detector
0 to 10,000 mrem/hr Range
Gamma Rejection up to 10 R/hr​
​​Rugged
4-Decade Analog Meter
Complete Turn-Key System
Data Sheet
Product Manual
Model 42-49 Neutron Detector Manual

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Model 12-4
Ludlum Part Number: 48-1200
Neutron Radiation Dose Rate Meter
9 in. Moderated H-3 Proportional Detector
0 to 10,000 mrem/hr Range
Gamma Rejection up to 10 R/hr
4-Decade Analog Meter
Transport/Storage Case Available P/N 2310277
​Download BF3 Tube Replacement Instructions
Data Sheet
Product Manual

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Model 30-4
Ludlum Part Number: 48-4191
Neutron Radiation Dose Rate Meter
Multi-Function Digital Display Unit
Low-Weight Device Substitutes for Ratemeter
Simple Switching Between Two Sets of Units
​​​Display Unit Detaches for Greater Versatility​
​​9 in. Moderated H-3 Proportional Detector
0 to 10,000 mrem/hr Range
Gamma Rejection up to 10 R/hr
Data Sheet
Product Manual (Model 30)

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Model 2241-4
Ludlum Part Number: 48-2973
Neutron Radiation Dose Rate Meter
9 in. Moderated H-3 Proportional Detector
0 to 10,000 mrem/hr Range
Gamma Rejection up to 10 R/hr
​Independent Adjustable Alarms for Ratemeter and Scaler Modes, RS-232 Connection
Ratemeter with Built-in Scaler Function
Transport/Storage Case Available P/N 2310277
Download BF3 Tube Replacement Instructions
Data Sheet
Product Manual
Data Logging Data Sheet​
Free PC Data Logging Software

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Model 2363/42-41L
Ludlum Part Number: 48-3514
Independent Gamma and Neutron Radiation Measurements
​​Gamma Rejection up to 100 mR/hr
External PRESCILA Proton Recoil Detector
Internal Energy Compensated GM Detector
​Light-Weight Neutron Detection System
0.1 mrem/hr-1 Rem/hr Neutron Detection Range
0.1 mR/hr-1 R/hr Gamma Detection Range
​Scaler and Data Logging Capabilities
Data Sheet
Product Manual (Model 2363)
Product Manual (Model 42-41L)
Energy Response


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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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