公开(公告)号：US3449573A

公开(公告)日：1969-06-10

申请号：US3449573D

申请日：1966-11-21

Applicant: COMMISSARIAT ENERGIE ATOMIQUE

Inventor： LANSIART ALAIN ,  MORUCCI JEAN PIERRE ,  ROUX GEORGES

IPC: H01J47/10 ,  H01J39/02

CPC classification number: H01J47/10

公开(公告)号：US3560746A

公开(公告)日：1971-02-02

申请号：US3560746D

申请日：1968-08-14

Applicant: COMMISSARIAT ENERGIE ATOMIQUE

Inventor： LANSIART ALAIN ,  LELOUP JEAN ,  LEQUAIS JEAN

IPC: H01J47/10 ,  G01T1/16 ,  H01J39/26

CPC classification number: H01J47/10

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.