The invention relates to a gas drift detector (100) comprising: a chamber formed by: a housing (102) having a first end and a second end; a radiation window (104) arranged to cover an opening of the first end of the housing (102); and a substrate (106) arranged to cover an opening of the second end of the housing (102), an anode (110) arranged to the substrate (106), one or more conductive rings (108) arranged on a surface (106a) of the substrate facing inside the chamber, and an amplifier (112) arranged to the opposite surface (106b) of the substrate than the conductive rings (108). The amplifier (112) is electrically connected to the anode (110). The chamber is filled with a gas.

The invention relates to a gas drift detector (100) comprising: a chamber formed by: a housing (102) having a first end and a second end; a radiation window (104) arranged to cover an opening of the first end of the housing (102); and a substrate (106) arranged to cover an opening of the second end of the housing (102), an anode (110) arranged to the substrate (106), one or more conductive rings (108) arranged on a surface (106a) of the substrate facing inside the chamber, and an amplifier (112) arranged to the opposite surface (106b) of the substrate than the conductive rings (108). The amplifier (112) is electrically connected to the anode (110). The chamber is filled with a gas.

A fissile neutron detection system includes a neutron moderator and a neutron detector disposed proximate such that a majority of the surface area of the neutron moderator is disposed proximate the neutron detector. Fissile neutrons impinge upon and enter the neutron moderator where the energy level of the fissile neutron is reduced to that of a thermal neutron. The thermal neutron may exit the moderator in any direction. Maximizing the surface area of the neutron moderator that is proximate the neutron detector beneficially improves the reliability and accuracy of the fissile neutron detection system by increasing the percentage of thermal neutrons that exit the neutron moderator and enter the neutron detector.

A fissile neutron detection system includes a neutron moderator and a neutron detector disposed proximate such that a majority of the surface area of the neutron moderator is disposed proximate the neutron detector. Fissile neutrons impinge upon and enter the neutron moderator where the energy level of the fissile neutron is reduced to that of a thermal neutron. The thermal neutron may exit the moderator in any direction. Maximizing the surface area of the neutron moderator that is proximate the neutron detector beneficially improves the reliability and accuracy of the fissile neutron detection system by increasing the percentage of thermal neutrons that exit the neutron moderator and enter the neutron detector.

A narrow thermal neutron detector includes a slidably receivable ionization thermal neutron detector module within an overall housing body. An active sheet layer of the ionization thermal neutron detector module can be tensioned across its width. The ionization thermal neutron detector module can include module upper major surface extents and module lower surface extents such that, when installed within the housing body, the module upper major surface extents are in a first spaced apart confronting relationship with housing upper major surface extents to define a first clearance and module lower major surface extents are in a second spaced apart confronting relationship with housing lower major surface extents to define a second clearance to accommodate housing flexing due to ambient pressure change. The housing body can be formed with a single opening for receiving the ionization thermal neutron detection module or with opposing first and second opposing end openings.

A narrow thermal neutron detector includes a slidably receivable ionization thermal neutron detector module within an overall housing body. An active sheet layer of the ionization thermal neutron detector module can be tensioned across its width. The ionization thermal neutron detector module can include module upper major surface extents and module lower surface extents such that, when installed within the housing body, the module upper major surface extents are in a first spaced apart confronting relationship with housing upper major surface extents to define a first clearance and module lower major surface extents are in a second spaced apart confronting relationship with housing lower major surface extents to define a second clearance to accommodate housing flexing due to ambient pressure change. The housing body can be formed with a single opening for receiving the ionization thermal neutron detection module or with opposing first and second opposing end openings.

A beam profile measurement (BPM) system is described including a BPM phantom including a tank to house liquid, a dosimeter disposed in the tank to detect ionization of a radiation beam emitted from a linear accelerator (LINAC), and a positioning device to move the dosimeter in a vertical direction. The BPM system also includes a BPM controller to operably couple to the BPM phantom and the LINAC. A method is described including positioning, using a BPM controller, a dosimeter of the BPM phantom in a first location, positioning, using the BPM controller, the LINAC in a second location, performing, using the BPM controller, a first movement of the LINAC from the second location to a third location, emitting a radiation beam from the LINAC during the first movement, and performing, via the dosimeter, an ion measurement of the radiation beam during the emitting.

A beam profile measurement (BPM) system is described including a BPM phantom including a tank to house liquid, a dosimeter disposed in the tank to detect ionization of a radiation beam emitted from a linear accelerator (LINAC), and a positioning device to move the dosimeter in a vertical direction. The BPM system also includes a BPM controller to operably couple to the BPM phantom and the LINAC. A method is described including positioning, using a BPM controller, a dosimeter of the BPM phantom in a first location, positioning, using the BPM controller, the LINAC in a second location, performing, using the BPM controller, a first movement of the LINAC from the second location to a third location, emitting a radiation beam from the LINAC during the first movement, and performing, via the dosimeter, an ion measurement of the radiation beam during the emitting.

A fissile neutron detection system includes a neutron moderator and a neutron detector disposed proximate such that a majority of the surface area of the neutron moderator is disposed proximate the neutron detector. Fissile neutrons impinge upon and enter the neutron moderator where the energy level of the fissile neutron is reduced to that of a thermal neutron. The thermal neutron may exit the moderator in any direction. Maximizing the surface area of the neutron moderator that is proximate the neutron detector beneficially improves the reliability and accuracy of the fissile neutron detection system by increasing the percentage of thermal neutrons that exit the neutron moderator and enter the neutron detector.

A fissile neutron detection system includes a neutron moderator and a neutron detector disposed proximate such that a majority of the surface area of the neutron moderator is disposed proximate the neutron detector. Fissile neutrons impinge upon and enter the neutron moderator where the energy level of the fissile neutron is reduced to that of a thermal neutron. The thermal neutron may exit the moderator in any direction. Maximizing the surface area of the neutron moderator that is proximate the neutron detector beneficially improves the reliability and accuracy of the fissile neutron detection system by increasing the percentage of thermal neutrons that exit the neutron moderator and enter the neutron detector.