Abstract The invention proposes a particle detector comprising a gasfilled chamber in which are disposed an anode and a cathode separated by a grid, these three electrodes being parallel and the gap between the grid and the cathode being of sufficient width for the type of incident radiation. The filling gas is selected in order to ensure that a high proportion of the Beta radiation which constitutes the incident particles or which is induced by incident particles at the cathode and/or within said gap loses the larger part of its energy by the usual ionization process which results in the release of electrons, said detector further comprising means for establishing between the anode and the grid a potential difference which is slightly smaller than the breakdown voltage and between the cathode and the grid a voltage for collecting said electrons towards the grid-anode gap, said collection voltage being sufficiently low and the mesh of the grid being sufficiently large to ensure that only a negligible proportion of electrons is collected by the grid as said electrons pass through said grid.
Inventors
👤 Alain Lansiart
👤 Jean Leloup
👤 Jean Lequais
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 23:25
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A nuclear particle detector as described in claim 1 wherein the potential imposed between the cathode and grid is of a value sufficient to establish an electric field in the range of 10 to 100 volts per centimeter in the acceleration chamber; the gas within said enclosure is argon-methane maintained at atmospheric pressure; and said grid is composed of a lattice of wires having a lattice pitch of approximately 75 microns, said wires having a diameter of one-third to one-half of said pitch.
Claim 2
Dependent Claim
29 words
A nuclear particle detector as described in claim 1 wherein said cathode is composed of a thin layer of metal for producing Beta -ray emission as it absorbs photons.
Claim 3
Dependent Claim
29 words
A nuclear particle detector as described in claim 1 wherein the gas within said enclosure is chosen to produce Beta ray emissions as it absorbs X-ray and gamma -radiation.
Claim 4
Dependent Claim
38 words
A nuclear particle detector as described in claim 1 wherein a plate having parallel holes therethrough is fixed adjacent to a surface of said enclosure to form a collimator for radiation directed towards said cathode from a sample.
Claim 5
Dependent Claim
23 words
A nuclear particle detector as described in claim 1, the enclosure of which is filled with a gas mixture of xenon and diethylamine.
Claim 6
Dependent Claim
22 words
A nuclear particle detector as described in claim 6, wherein the pressure of the gas mixture is approximately 760 mm. of mercury.
Claim 7
Dependent Claim
24 words
A nuclear particle detector as described in claim 7, wherein the partial pressure of diethylamine is comprised between 8 and 50 mm. of mercury.