Electroradiographic device

Details Electroradiographic device Electroradiographic device

1976-06-24

1978-01-31

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, 313 93, G01T 118

Patent

active

040717631

ABSTRACT:
Xonics chambers can normally be used only with comparatively low electrode voltages in the Townsend-plateau region of the discharge where no charge carrier multiplication occurs. The sensitivity is then comparatively low. The sensitivity can be increased by increasing the electrode voltage, but this gives rise to a high electrode voltage for a reasonable charge carrier multiplication. According to the invention a gas is added whose ionization energy is smaller than the energy of the lowest metastable levels of the rare gas in the chamber. The charge carrier multiplication, and hence the sensitivity is thus 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.

REFERENCES:
patent: 3126479 (1964-03-01), Mattson
patent: 3560746 (1971-02-01), Lansiart
patent: 3911279 (1975-10-01), Gilland et al.
patent: 3930162 (1975-12-01), Reiss
patent: 3969624 (1976-07-01), Van Biesen et al.
patent: 3975638 (1976-08-01), Grunberg et al.
patent: 3988583 (1976-10-01), Fukase et al.
"Electron & Nuclear Counters" by Serge Korff (4th Printing), Van Nostrand Co., (1948), pp. 89-111.

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