公开(公告)号：US3812358A

公开(公告)日：1974-05-21

申请号：US37214873

申请日：1973-06-21

Applicant: NASA

Inventor： FLETCHER J ,  KRAUSHAAR W

IPC: H01J47/06 ,  G01T1/18 ,  H01J39/28

CPC classification number: H01J47/06

Abstract: A coaxial anode construction for a gas radiation counter is disclosed by which undesirable background ionization interference may be suppressed. The anode comprises an elongated central wire covered with an electrically insulating sleeve. A plurality of longitudinally discontinuous segments of an electrically conductive coating is disposed about the insulating sleeve in coaxial relationship to and along the length of the central wire. In the preferred inventive embodiment, the plurality of conductive coating segments define a so-called veto or rejection anode at each end portion of the central wire and a main or primary charge detecting anode disposed therebetween. Coupling means are connected to each of the segments such that the primary charge detecting anode is connected to detection circuitry in anti-coincidence with the veto anodes. Background radiation detected by either of the veto anodes and the primary charge detecting anode is therefore rejected and the sensitivity of the radiation counter device is increased.