Gaseous-based radiation detector and apparatus for radiography
AssigneeXCounter AB
InventorsTom Francke, Juha Rantanen, Christer Ullberg
Life of this patent
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Abstract
A detector for detection of ionizing radiation comprises a cathode; an anode; an ionizable gas arranged between these electrodes; a radiation entrance arranged such that ionizing radiation can enter and ionize the ionizable gas; and a readout arrangement. A voltage across the electrodes causes electrons created during ionization of the gas to drift towards the anode, where the readout arrangement detects them. To reduce the risk of occurrence of sparks, and/or to reduce the energy in occurring sparks, one of the cathode and anode has at least the surface layer facing the other electrode made of a material having a resistivity of at least 5×10−8 Ωm.
Claims60
A detector for detection of ionizing radiation comprising:
- a cathode arrangement and an anode arrangement between which a voltage is applicable;
- a space capable of being filled with an ionizable gas and arranged at least partly between said first cathode and said first anode;
- a radiation entrance arranged such that ionizing radiation can enter said space between said first cathode and said first anode, for ionizing the ionizable gas;
- and
- a readout arrangement;
- wherein
- said voltage is applicable for drifting electrons created during ionization of said ionizable gas towards the anode arrangement;
- and
- said readout arrangement is arranged for detection of the electrons drifted towards the first anode, wherein
- at least one of the cathode and anode arrangements has at least the surface layer facing the other one of the cathode and anode arrangements made of a material having a resistivity of at least 5×10−8 Ωm.
A detector for detection of ionizing radiation, comprising:
- first and second electrode arrangements between which a voltage is capable of being applied;
- a space arranged between the electrode arrangements and capable of being filled with an ionizable gas;
- a radiation entrance arranged such that ionizing radiation is enterable into said space for ionizing the ionizable gas;
- a device for electron avalanche amplification of electrons arranged between the first and second electrode arrangements;
- and
- at least one arrangement of readout elements for detection of electron avalanches;
- wherein
- at least one of the first and second electrode arrangements comprises a resistive material having a surface facing the other electrode arrangement.
A detector for detection of ionizing radiation comprising:
- a cathode arrangement and an anode arrangement between which a voltage is applicable;
- a space capable of being filled with an ionizable gas and arranged at least partly between said cathode and anode arrangements;
- a radiation entrance arranged such that ionizing radiation can enter said space between said cathode and anode arrangements, for ionizing the ionizable gas;
- and
- a read-out arrangement;
- wherein
- said voltage is applicable for drifting electrons created during ionization of said ionizable gas towards the anode arrangement;
- said read-out arrangement is arranged for detection of the electrons drifted towards the anode arrangement, or correspondingly produced ions;
- and
- said cathode arrangement has at least a portion of the surface layer facing the anode arrangement made of a material having a resistivity between 1×10−3 Ωm and 1×103 Ωm.
Dependencies are inferred from the claim text.