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    Ionization chamber
    3.
    发明授权
    Ionization chamber 失效
    电离室

    公开(公告)号：US4131799A

    公开(公告)日：1978-12-26

    申请号：US783630

    申请日：1977-04-01

    Applicant: Volker A. W. Stieber

    Inventor： Volker A. W. Stieber

    IPC: G01T1/185 ,  G01T1/29 ,  H01J47/02 ,  H01J39/285

    CPC classification number: H01J47/02 ,  G01T1/29

    Abstract: An ionization chamber for analyzing inhomogeneities in a radiated beam from a particle accelerator system has two measuring chambers formed by three mutually parallel walls spaced apart by spacer rings. Two of the three walls have single electrodes arranged thereon whereas a third wall has several mutually insulated electrodes applied on a measuring chamber side of the wall. The mutually insulated electrodes include a central circular electrode and a group of electrode segments arranged in circular fashion around the central electrode. Inhomogeneities in the radiation intensity of a beam being analyzed are detected by unequal currents in the central electrode relative to surrounding electrode segments or in the electrode segments themselves relative to each other.

    Abstract translation: 用于分析来自粒子加速器系统的辐射束中的不均匀性的电离室具有由间隔环间隔开的三个相互平行的壁形成的两个测量室。 三个壁中的两个具有布置在其上的单个电极，而第三壁具有施加在壁的测量室侧上的若干相互绝缘的电极。 相互绝缘的电极包括中心圆形电极和围绕中心电极以圆形方式布置的一组电极段。 被分析的光束的辐射强度的不均匀性通过中心电极中相对于周围电极段的不相等的电流或电极段本身相对于彼此来检测。

    5.
    发明专利
    未知

    公开(公告)号：NL7704813A

    公开(公告)日：1977-11-08

    申请号：NL7704813

    申请日：1977-05-02

    Applicant: GEN ELECTRIC

    IPC: A61B6/03 ,  A61B6/00 ,  G01T1/185 ,  H01J47/02 ,  H01J39/285 ,  H01J39/04

    Abstract: An improved ionization chamber type x-ray detector comprises a heavy gas at high pressure disposed between an anode and a cathode. An open grid structure is disposed adjacent the anode and is maintained at a voltage intermediate between the cathode and anode potentials. The electric field which is produced by positive ions drifting toward the cathode is thus shielded from the anode. Current measuring circuits connected to the anode are, therefore, responsive only to electron current flow within the chamber and the recovery time of the chamber is shortened.

    Multichannel X=ray detector esp. for computer tomography - has cells of differing measuring capacity increasing speed and accuracy
    8.
    发明专利
    Multichannel X=ray detector esp. for computer tomography - has cells of differing measuring capacity increasing speed and accuracy 未知

    公开(公告)号：NL7703944A

    公开(公告)日：1978-10-16

    申请号：NL7703944

    申请日：1977-04-12

    Applicant: PHILIPS NV

    IPC: A61B6/03 ,  H01J47/06 ,  H01J39/285 ,  A61B6/02 ,  G01T1/185

    Abstract: An X-ray detector using a gas which is ionised by the radiation to be detected, has when viewed from the direction of the approaching radiation, a series of detection channels which can be monitored separately. Each detecting channel has >=2 detecting cells with a different filling of gas. Pref. when viewed in the direction of the radiation to be detected, the gas filled cells are next to each other, or alternatively they may be one behind the other. Pref. each cell comprises a cylindrical tube which acts as a cathode. and is closed at one end by a window transparent to X-rays. The tube may also have an axially extending wire forming an anode which may be attached to the window of the material of which is gastight, electrically-insulating and resistant to X-rays, e.g. synthetic material, a ceramic or a glass. The cell pref. contains Xe, Kr, Ar, Ne and/or He, to which a small amt. of a gas such as CO2 or H2 which can be regenerated, is esp. added. Use of two detector cells having measuring ranges between 106 and 108 and 108 and 1010 roentgen quanta per second, the output signals of the two cells being fed to a logic circuit where the output signal for the channel is formed, eliminates the prior need for a choice between a longer investigative period and low accuracy.

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