Figure 7.18: Tritium Surface Contamination Monitor: Trolley
with UMO basic unit, Tritium probe, β-γ-probe and
P10 gas cylinder, UMO is replaced by LB 134
7.9.2 Application
The Tritium probe LB 1239 is a windowless proportional counter
tube detecting Tritium on plane surfaces with very high efficien-
cy. This counter tube makes it possible to meet the detection
limit stipulated by the German Radiological Protection Act for
surface contamination with Tritium on large flat areas.
The Tritium probe incorporates a preamplifier and a high volt-
age generator; for measurement, it simply has to be connected
to the basic LB 134 unit via a 8-pin cable and a P10 gas supply
tubing.
The user-friendly assembly of the instruments on a trolley with
P10 gas cylinder as gas supply and a console for the Tritium
probe with automatic gas shut-off ensures simple and quick
handling in the laboratory. In addition, a β-γ-probe can be
mounted on the console (optional) and connected to the LB 134
by changing the connection cable
7.9.3 Probe Assembly
The Tritium probe LB 1239 is a windowless proportional counter
tube incorporating a preamplifier and a high voltage unit. The
LB 134 software identifies the probe and controls the high volt-
age.
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 cham-
ber is only 5 mm high. This reduces both background and gas
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