Electroradiographic device

Details Electroradiographic device Electroradiographic device

G - Physics

03

G

358/34

G03G 15/054 (2006.01)

Patent

CA 1059657

ABSTRACT: The so-termed xonix chambers can be used only with comparatively low electrode voltages in the so-termed Townsend-plateau region of the discharge where no charge carrier multiplication occurs. The sensitivity, however, is then comparatively low. The sensitivity can be increased by increasing the electrode voltages, but this gives rise to high electrode voltages for a reasonable charge carrier multiplication. When a gas is added whose ionisation energy is smaller than the energy of the lowest metastable levels of the rare gas present in the chamber, the charge carrier multiplication, and hence the sensitivity, can be improved without the electrode voltage being substantially increased. For example, when 0.2% by volume trimethylamine is added, an electrode voltage of 13 kV already suffices.

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