Process and device for determining the spatial distribution of e

Details Process and device for determining the spatial distribution of e Process and device for determining the spatial distribution of e

1989-10-18

1991-07-16

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250374, G01T 1185

Patent

active

050327291

ABSTRACT:
A device according to the invention includes: a gas detector, comprising at least one chamber (2) and containing a noble gas and a gas or vapor that emits photons between two parallel electrodes (3a, 3b) between which a continuous high voltage (HT) is applied, whereby a first electrode (3a) is intended for receiving, against its external face, the surface of the radioactive body (5,6) to be observed; a brilliance amplifier (13) arranged for receiving the photons emitted by the excited atoms which are produced in the vicinity of a second electrode (3b) by the electron avalanche ascribable to the electrical field between the first and second electrodes; a camera (12) arranged behind the brilliance amplifier; and computing means (15) capable of computing, from the output signal of the camera, the entrance points (9) in said gas detector, at the first electrode, of the electrons emerging from said surface of the radioactive body.

REFERENCES:
patent: 4286158 (1981-08-01), Charpak et al.
patent: 4670656 (1987-06-01), Bolon
patent: 4686368 (1987-08-01), Anderson et al.
Conde et al., "The Argon Uniform-Field Gas Proportional Scintillation Counter: Improved Energy Resolution for .alpha.-Particles and its Behaviour for X-Rays", Nucl. Instrum and Methods, 124 (1), Feb. 1975, pp. 307-308.
"Studies of Light Emission by Continuously Sensitive Avalanche Chambers" by Charpak et al., Nuclear Instruments and Methods in Physics Research, A269 (1988), pp. 142-148.

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