• Measurement of thermal neutrons up to 20 MeV Neutrons
  • Energy dependence ± 30% between 50 keV and 10 MeV
  • The measuring results are shown on the easy to operate Universal Monitor (UMo II) LB 134 with display and data storage


  • Can be used both as a portable measuring device and as a stationary monitor
  • Calibrated to the ambient equivalent dose H*(10) for neutrons

High Sensitivity

  • Extremely high sensitivity: approx. 3 pulses per nSv
  • Short measurement times in weak neutron fields

Different Versions

LB 6411



The LB 6411 probe can be used as a portable monitor and as a stationary measuring instrument. Major areas of application are reactors and the nuclear fuel cycle in the nucleartechnical field, accelerators in research, and the use of neutron sources in the industrial fields.

The LB 6411 probe consists of a polyethylene (PE) moderator sphere with a composite 3He recoil proton counter tube, LB 6410, at its center. The probe also includes a high voltage supply and preamplifier.


Universal Monitor (UMo II) LB 134

Universal Monitor only monitor adn without connection cable

LB 6411-Pb

For high energy applications at several hundred MeV or even higher there is a special version with an external layer of 10 mm lead available. The response to high energy neutrons is enhanced by utilizing spallation neutrons, which are generated in the lead.

Technical Data

Neutron Monitoring Specifications 
Dose rate range30 nSv/h – 100 mSv/h
Energy rangethermal to 20 MeV
Calibration factor

1.27 µSv/h per cps

Background< 0.02 cps
Typehandheld & stationary monitor
External diameter250 mm
Materiallow pressure polyethylene with 2% carbon additive
Density0.95 g/cm3
Weight9.2 kg
Universal Monitor UMo LB 134 
Displaymonochrome LCD 192 x 64 pixel Electro-luminescence illumination
Measurement modes

ratemeter, scaler-timer, search mode

Data memory2400 measured values with date & time
Weight1400 g (with batteries)
CommunicationUSB (1 device, 1 host for memory stick), RS 485
Protection classIP 53 (according to IEC 60529)