Berthold
LB 1342

Contamination Probe

Download Datasheet

The LB 1342 scintillator probe for α, β, γ and X-ray radiation is designed with a 170 cm² surface area. The contamination detector uses a single scintillator made of zinc sulphide (ZnS) to measure radioactivity. The resulting flashes of light are conducted by a suitable reflector to a photomultiplier with a suitable preamplifier and discriminator stage and measured.

Results can be displayed either as a count rate (cps) or as area activities (Bq/cm²). A metal grid protects the entrance window of the detector against damage.

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Description

The LB 1342 scintillator probe for α, β, γ and X-ray radiation is designed with a 170 cm² surface area. The contamination probe has a window foil that is sensitive to mechanical damage, and it is therefore protected by a protective grid. However, everything should be done to avoid the destruction of the window foil such as sharp objects, measurement on rough surfaces, rose bushes, and cat’s paw retractors.

Nevertheless, a damaged LB 1342 detector window foil can easily be replaced by the user. Berthold supplies a foil stretched over a frame as a spare part.

The measuring results are presented on the easy to operate battery Universal Monitor (UMo II) LB 134 with display, data storage and printer output.

Features

  • High measuring accuracy
  • A precise distinction of radiation types
  • High sensitivity even at low energies
  • Low costs for the scintillator
  • Ease of maintenance
  • Unique simultaneous and separate measurement of α and β-y radiation
  • The individual types of radiation can be distinguished by means of special evaluation and correlation circuits, and thus separated and measured at the same time.
  • No counting gas required
  • 118 mm x 145 mm (170 cm²) at the transmission of 80%
  • It is protected by a protective grid
  • Background: alpha channel approx. 0.1cps, beta channel approx. 15cps

For more details, please refer to the datasheet.

Specifications

Sensitive detector area118mm x 145mm, 170 cm²
Entrance windowlayer thickness: 6 µm, weight per unit area: 0.4 mg/cm²
Geometric transmission80%
BackgroundAlpha channel: approx. 0.1cps, Beta channel: approx. 10cps
Sensitivity to 1 µSv/h external gamma radiation (Cs-137)Alpha channel: not detectable, Beta channel: < 100cps
Spilloveralpha into beta channel (Po-210): < 20%, Beta into Alpha channel (Sr-90): < 2*10-5
Local variation responsivenessboth channels: ±20%
Temperature range (no condensation)temperature range operation: -20°C to +40°C
Temperature rangetemperature range storage: -40°C to +60°C
Protection typeIP53
Light-proof/ Entrance windowSunlight <10cps