Highlights

General

  • Very high efficiency

  • User-friendly assembly

  • Reduced both background and gas consumption

Features

  • Surface being monitored without coming in contact

  • Three parallel counting wires ensure a constantly high response probability

Monitoring

  • Connected to the basic LB 134 unit via a 8-pin cable and a P10 gas supply tubing.
  • The LB 134 automatically identifies the probe after power on, switches to the CPS mode and takes over the HV control

Product Overview

LB 1239

The windowless counter tube aperture is 150 mm x 15 mm with an effective area of 22 cm². Electrically it is terminated by five thin cathode wires and mechanically it is enclosed by a fine-mesh nylon grid providing dust protection. The counting chamber is only 5 mm high. This reduces both background and gas consumption and ensures a steady gas flow. Three parallel counting wires ensure a constantly high response probability over the entire aperture area.

Four spacers keep the detector at a constant distance of 2 mm from the surface being monitored without coming in contact with it.

We supply an aperture plate as an accessory which is held in position by magnets. It is used, for example, to measure finger tips.

 

The window side of the Tritium probe LB 1239

The window side of the Tritium Probe LB 1239

Technical Data

Detector 
Type

Flow-through windowless proportional counter tube and detecting tritium on plane surfaces 

Counter tube aperture150 x 15mm with 3 parallel counting wires
Effective area22cm² (150mm x 15mm) 
System efficiency85% - typical
Background1 cps - typical 
Gas consumption2000 cm³/min 
Counting gas supply  
Counting gas

P-10

Air flow components  cylinder valve, double pressure reducer and rotameter
Internal diameter5mm 
Electronics 
Designation basic unit LB 134 
Results display

Monochrome LCD 192 x 64 pixel, background illumination, electro – luminescence 

CommunicationUSB [1device; 1 host for memory stick], RS 485 

Enclosures

 
Dimensions160 x 160 x 55 (L x W x D) mm
Weightapprox. 1400g (with batteries)