Process and device for determining the spatial distribution of electrons emerging from the surface of a radioactive body
First Claim
1. A process for determining the spatial distribution of electrons or β
- -rays emerging from a surface of a radioactive body, wherein said surface is placed to actuate a gas detector including at least one chamber with a first electrode and a second electrode and containing, between said first and second electrodes, a noble gas and a gas or vapor that emits photons in response to the impact of electrons, said radioactive body to be observed being placed directly against said first electrode, and wherein the position of the impacts, in the detector, of the electrons originating from said surface is determined by observing the photons, created by an electron avalanche resulting from a multiplication between these electrodes, by means detecting the photons and computing the center of gravity of the distribution of said photons.
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Accused Products
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.
72 Citations
12 Claims
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1. A process for determining the spatial distribution of electrons or β
- -rays emerging from a surface of a radioactive body, wherein said surface is placed to actuate a gas detector including at least one chamber with a first electrode and a second electrode and containing, between said first and second electrodes, a noble gas and a gas or vapor that emits photons in response to the impact of electrons, said radioactive body to be observed being placed directly against said first electrode, and wherein the position of the impacts, in the detector, of the electrons originating from said surface is determined by observing the photons, created by an electron avalanche resulting from a multiplication between these electrodes, by means detecting the photons and computing the center of gravity of the distribution of said photons.
- View Dependent Claims (2)
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3. A device for determining the spatial distribution of the electrons emerging from a surface of a radioactive body, comprising:
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a gas detector including at least one chamber with a pair of parallelly disposed electrodes and containing both a noble gas and a gas or vapor that emits photons between said electrodes, and means for applying a continuous high voltage between said electrodes, whereby a first electrode of said pair comprises means for receiving, against its external face, the surface of the radioactive body to be observed; a brilliance amplifier arranged for receiving the photons that are emitted by excited atoms which are produced in the vicinity of the other electrode of said pair by electron avalanches resulting from an electrical field between said electrodes produced by said continuous high voltage; a camera arranged behind the brilliance amplifier; and computing means capable of computing, in response to an output signal of the camera, entrance points in said gas detector, at the first electrode, of the electrons emerging from said surface of the radioactive body. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification