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Schematic Construction of a DNX-Detector
(here at the example of the DNX 300TN)

The DNX 300TN exists of a body (Al-Mg3) which takes up a series of electrodes and is closed by a pressure resistant lid (Al-Mg4,7M). Into the lid the neutron entry window is milled. The window size of 300 mm x 300 mm corresponds to the surface spanned by the electrode wires. The proof volume is limited by two drift electrodes at a distance of 5 mm to the X and Y cathodes. The distance of the first drift electrode to the second drift electrode amounts to 20 mm. The drift electrode in the entry window is a metallic foil which is vulcanized by an insulator with the window to avoid a dead volume between the drift electrode and the input window. The materials are so selected that absorption or dispersion of the neutrons can be neglected practically.


Fig.1: Explosion drawing
of the case, the electrodes
and the lid of the
detector DNX 300TN
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