• Simultaneous measurement of artificial alpha and beta aerosols
  • Direct measurement of activities at the dusting site
  • Compensation and measurement of natural radioactivity (Rn/Tn daughters)



  • 3-way large area proportional detector with high alpha and beta efficiency
  • Accumulation of aerosols on a 200 mm Ø large-area filter
  • Continuous measurement and alarm check during dusting

Additional Features

  • Energy-independent measurement method
  • Independent of radon/thoron ratio
  • Largely independent of the state of equilibrium of the radon/thoron derivatives (dependent on air extraction at the installation site)

Product Overview

LB 150 D-R


The Alpha-Beta-particulates monitor LB 150 D-R can be deployed for the measurement of airborne artificial Alpha and Beta activity in

  • Nuclear facilities in the Nuclear fuel cycle and Fission product production
  • Storage and processing of Nuclear waste products
  • Hot Cell Labs
  • Monitoring of Alpha emitting (transuranic) substances

The Particulates Monitor LB 150 D-R uses a fixed filter and is a true real time Monitor while collection, detection and evaluation are done simultaneously.


The very high sampling rate of 40 m³/h ensures a representative sampling for both Stack monitoring with Isokinetic extraction as well as Room or workplace air monitoring.

Particulates collection and Detector

The sampled air is drawn through an S-class glass fiber filter with 200 mm Ø. The detector, a large surface proportional counter with thin entrance window, is located directly above the collection area at a distance of 7 mm and measures the radiation intensity from Alpha and Beta decays.

The airtight particulates collection unit can be constructed in Stainless steel or in Teflon depending on the application.

Read More

LB 150 open drawer with filter

200 mm ∅ Filter support sinter plate with drawer mechanism

Technical Data

Pumpsilent turbine pump
Filter diskglas fiber filter, S-class No. 8, Ø 200 mm or equivalent
Ambient Conditions 
Ambient temperature

0 to 50 °C

Sample air temperatureup to 85°C
Humiditymax. 95 % rel. humidity
Type3-fold Proportional counter tube GFDZ 200 in Sandwich construction
Lead shield4 pi 2 cm (5 cm optional)
Counting gasMethane, Natural Gas, Propane P10 or Ar-CO2 90/10
Gas consumptionapprox. 2 l/h