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Technology Factsheet

Neutron Meters

Category: Characterization > Monitors > Radiation Monitors
Reference # : Model No :

Ludlum Measurements, Inc. offers the following neutron meter models:

Model 12-4 is an industry standard neutron dose rate instrument that conforms to the RPG curve with a measuring range of 0–100 Sv/h (0–10,000 mrem/hr) from thermal to 12 MeV. The detector is a 22.9 cm (9 in.), moderated ³He tube with a gamma background rejection up to 100 mSv/h (10 R/hr). The ratemeter is a four-decade analog meter.
• Moderated Neutron Detector
• Range: 0–100 mSv/h (0–10,000 mrem/hr)
• Gamma Rejection up to 0.1 Sv/h (10 R/hr)
• 4-Decade Analog Meter

Model 2241-4 is a portable neutron REM meter that combines Ludlum's microprocessor-based digital ratemeter/scaler model 2241 electronics with a model 42-31H neutron detector. This system is sensitive to neutrons from thermal to 12 MeV with a response approximating the inverse RPG curve for neutron dose.
• Four-digit LCD with moving decimal point.
• 22.9 cm (9 in.) Moderated Neutron Detector
• Range: 0–100 mSv/h (0–10,000 mrem/hr)
• Gamma Rejection up to 0.1 Sv/h (10 R/hr)
• Ratemeter with Built-in Scaler Function
• Autoranging
• RS-232 Connection

A gamma/neutron survey meter that combines the Model 2363 survey meter with the Model 42-41L PRESCILA neutron detector.
• Gamma detector is an energy compensated GM housed internally to the survey meter
• Neutron detector is a proton recoil type
• Neutron Detection Range: 0.1 mrem/hr to 1 Rem/hr
• Gamma Detection Range: 0.1 mR/hr to 1 R/hr
• Scaler & data logging capabilities

Model 15 detects and measures alphas, betas, gammas, and neutrons.
• Neutron Detector with Removable Moderator
• Alpha Beta Gamma GM Detector
• Rugged
• 4-Decade Analog Ratemeter


Model 12-4: Complete turn-key system. Rugged design. Splashproof shields for outdoor use.

Model 2241-4: Independent adjustable alarms for ratemeter & scaler modes. Audible alarms may be acknowledged and silenced. Can be programmed via its RS-232 port. Port can be used to output its readings at two-second intervals.

Model 42-41L (with Model 2363 survey meter): Light-weight neutron detection system (under 4.5 kg or 10 lb). Provides independent gamma and neutron measurements. Provides accurate results at less weight than the REM balls. Excellent gamma rejection up to 100 mR/hr.

Model 15: Rugged design. A complete turn-key system.





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