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It is possible to upgrade the D50 and D2000 versions to higher versions. Following
upgrades are possible:
x D50 → D2000
x
x D2000 → DF2000
4 RADON DETECTOR
In standard operating mode the measuring gas gets by diffusion through a large-
surface glass fiber filter into the ionization chamber. That is to say through the glass
fiber filter only the gaseous Radon-222 may pass, while the radon progeny
products are prevented to enter the ionizatio
n chamber. At the same time the
filter protects the interior of the chamber from contamination by dusty particles.
Alternatively, to the above mentioned diffusion mode with the AlphaGUARD type
DF2000 an active, i.e. pump-supported gas flushing of the ionization chamber can
be enforced. Here, the entrance of the gas is effected via gas inlet of the
AlphaGUARD
Ionization Chamber
The cylindric ionization chamber of the AlphaGUARD has an active volume of
0,56 l. Its metallic interior has a potential of +750 V when the instrument is turned
on. Along the longitudinal axis the stiff centre electrode is located which lies on a
potential of 0 V. The center electrode is connected with the signal input of the
h
ighly sensitive preamplifier unit. The worked up measuring signals of the
preamplifier unit are transmitted to an electronic network for further digital
processing.
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