LFM-3 Radiation Detection System

LFM-3 Radiation Detection System

Easily set up Thermo Scientific™ LFM-3 portal Radiation Detection System. It is an easy-to-use, multi-purpose Γ and X-ray detection system. The Thermo Scientific™ LFM-3 Radiation Monitoring System is designed to maximize sensitivity to Γ radiation, with a minimum of nuisance alarms, at an affordable price. The system is perfect for monitoring materials bound for landfills, transfer stations and other waste processing facilities.

The Thermo Scientific LFM Series Radiation Monitoring System product family has long been considered to be the benchmark for radiation monitoring in the hospital and solid waste industry, with hundreds of installed units. The LFM-3 builds on the proven, familiar detector design of previous LFM models and combines this with new, state-of-the-art electronics.

  • Robust, ruggedized detectors suitable for indoor or outdoor applications
  • Supplied with 200 ft. (60m) of cable for each detector, with a maxiumum capability up to 3,300 ft. (1000m)
  • High-performance system control unit with single button operation
  • Automated, natural background compensation system ready to operate within minutes of installation
  • Low, medium and high energy channels provide additional information about the type of radiation detected
  • Large, clear display screen and LEDs provide for easy interpretation of data

Cables connect the detectors to an easy-to-read digital readout electronics package. Operating the system does not require intensive training or specialized knowledge. The detectors are constructed to withstand temperature extremes. They also have low mass housings to detect and discriminate low, medium, and high gamma energies.


NaI Detectors

Radiation Detected: Low, medium, and high energy Γ and X-rays (>20keV)

Sensitivity: The following point sources, free in air at 7ft. (2.1m) from the detector face can be detected with a confidence level of 95%:

  • 1 Second Interval
    • 44.6 μCi (1.65MBq) Cs-137
    • 17.3 μCi (0.64MBq) Ba-133
    • 29.0 μCi (1.07MBq) Co-57
  • 15 Second Interval
    • 14.0 μCi (0.52MBq) Cs-137
    • 5.4 μCi (0.20MBq) Ba-133
    • 9.1 μCi (0.34MBq) Co-57

Detectors: Two, 2in.NaI(TI) scintillation detectors in low mass housings, constructed to withstand temperature extremes; they are also lead-shielded and shock mounted within special PVC housings

Size: D x L x H: 4.5 x 17.5 x 7in. (144 x 445 x 178mm)

Weight: 14.7 lb. (6.7kg)

Construction: Weatherproofed, painted PVC housings with liquid tight connections suitable for outdoor use

Operating Temperature: -4 to 122°F (-20 to 50°C)



The complete system consists of two shielded, 50.8mm (2in.) diameter,NaI (TI) scintillation detectors shock-mounted in separate weatherproof PVC housings.



  • Alarm Tower includes standard 50ft. (15m) of cable TF-401-10000050
  • Desktop Mounting Assembly 1100722
  • Response Optimization and Test Adapter Assembly LFM-00003-ME
  • Mini Desktop Receipt Printer (alarm activated) TF-120-0004


Recommended for:

  • Solid Waste Facilities
  • Transfer Stations
  • Waste to Energy Plants
  • Recycling facilities
  • Hospitals (Nuclear Medicine and Housekeeping)
  • Healthcare and Research


Downloads PM12 Personel Gamma Portal Monitor Datasheet: Download PDF (158 kB)