Abstract:
전계방출 방식의 엑스선 소스를 이용하여 경량화 및 소형화에 유리하면서도 엑스선 방출 성능의 신뢰성이 우수한 포터블 엑스선 방출 장치가 개시된다. 본 발명에 따른 포터블 엑스선 방출 장치는, 전자 방출원을 갖는 캐소드 전극, 엑스선 타겟면을 갖는 애노드 전극, 상기 캐소드 전극과 상기 애노드 전극 사이의 게이트 전극을 포함하는 전계방출 엑스선 소스; 및, 소정 전압의 직류 전원으로 상기 캐소드 전극, 애노드 전극 및 게이트 전극에 각각 인가되는 적어도 3개의 구동신호를 생성하는 구동신호 생성부를 포함한다. 상기 구동신호 생성부는 엑스선 방출 중에 상기 애노드 전극과 상기 캐소드 전극 사이의 관전류 값이 일정하게 유지되도록 하는 전류 제어부를 포함할 수 있다.
Abstract:
A portable XRF analyzer (10, 20, 30, 50, 60, 70, 80, 90) can include a hand shield (15) to substantially block x-rays from impinging on a hand of a user. The portable XRF analyzer can include a heat sink (31s) adjacent an x-ray source (11) and a heat sink (31d) adjacent an x-ray detector (12). The heat sinks can be separated from each other by a thermally insulative material.
Abstract:
An X-ray window comprises a primary (22) and a secondary window element (72, 74, 76). In order to evaporate debris by ohmic heating, current flows through the secondary (upstream) window element. Meanwhile, electric charge originating from electron irradiation and/or depositing charged particles is to be drained off the secondary window element via a charge-drain layer (76). To prevent large debris particles from short-circuiting the secondary window element, the current for heating the window element flows through heating circuitry (72) which is electrically insulated from the charge- drain layer.
Abstract:
An X-ray window comprises a primary (22) and a secondary (70) window element. In order to evaporate debris by ohmic heating, current flows through the secondary (upstream) window element. Meanwhile, electric charge originating from electron irradiation and/or depositing charged particles is to be drained off the window element. To prevent large debris particles from short-circuiting the window element and changing the desired heating pattern, the current for heating the window element flows through a layer (72) which is insulated from the charge-drain layer (76).
Abstract:
A method of operating an acceleration system comprises injecting charged particles into an RF accelerator, providing RF power to the accelerator, and accelerating the injected charged particles. The accelerated charged particles may impact a target to generate radiation. The RF power is based, at least in part, on past performance of the system, to compensate, at least partially, for dose and/or energy instability. A controller may provide a compensated control voltage ("CCV") to an electric power source based on the past performance, to provide compensated electric power to the RF source. A decreasing CCV, such as an exponentially decreasing CCV, may be provided to the electric power source during beam on time periods. The CCV to be provided may be increased, such as exponentially increased toward a maximum value, during beam off time periods. The controller may be configured by a compensation circuit and/or software. Systems are also described.
Abstract:
The present invention relates to X-ray radiation with multiple photon energies. To provide an X-ray tube capable of generating multiple-energy X-ray radiation with an improved switching capacity and a reduced design setup, a multiple-energy X-ray tube, comprises a cathode (12), an anode (14), and a switchable current controlling unit (16). The cathode comprises a first connection port (18), which is connectable with a negative terminal of a generator to be supplied with a high-voltage energy to generate a voltage potential between the cathode and the anode. The anode is an electrically floating isolated anode. The switchable current controlling unit is electrically arranged between the anode and a second connection port, which second connection port is connectable with a ground or positive terminal of the generator to provide an adjustable current transfer (30) from the anode via the switchable current controlling unit and the second connection port to the generator. Further, the switchable current controlling unit is controllably adaptable such that at least a first current transfer and a second current transfer are adjustable, wherein the second current transfer is different from the first current transfer. The first current transfer leads to a first voltage between the cathode and the anode resulting in an electron beam (86) which generates X-radiation with a first spectrum, and the second current transfer leads to a second voltage between the cathode and the anode resulting in an electron beam (86) which generates X-radiation with a second spectrum, wherein the first X-ray spectrum is different from the second X-ray spectrum.
Abstract:
An X-ray tube having a structure for suppressing discharge effectively at the distal end of an anode which is irradiated with electrons in order to generate X-rays, and an X-ray source including such an X-ray tube. An X-ray tube (1A) comprises a head defining an internal space for containing the distal end of an anode (5), an irradiation window for transmitting generated X-rays to the outside, an exhaust opening (17) provided in the inner wall surface of a housing in order to evacuate the internal space, and a shield structure (25) for concealing the exhaust opening from the distal end of the anode.
Abstract:
An X-ray generator (1) of open type comprising a section (15) for generating a high voltage (e.g. 160 kV) in order to enhance the handling by eliminating a high voltage cable, and a power supply section (14) where a grid connection wiring (32) and a filament connection wiring (33) are molded with resin, wherein the molded power supply section (14) is secured to the base of a tubular section (2) to realize an X-ray generator integrated with its power supply. The degree of freedom in the structure of the high voltage generating section (15) and that in the bending of the wiring (32, 33) are enhanced remarkably because the high voltage generating section (15), the grid connection wiring (32), and the filament connection wiring (33) are molded with resin.
Abstract:
A device for producing x-rays includes: a housing that includes a folded high-voltage multiplier coupled to a filament transformer, the transformer coupled to an x-ray tube for producing the x-rays. A method of fabrication and an x-ray source are disclosed.
Abstract:
Disclosed herein are a high-voltage generator for an x-ray source, an x-ray gun, an electron beam apparatus, a rotary vacuum seal, a target assembly for an x-ray source, a rotary x-ray emission target, and an x-ray source. These various aspects may separately and/or together enable the construction of an x-ray source which can operate at energies of up to 500 kV and beyond, which is suitable for use in commercial and research x-ray applications such as computerised tomography. In particular, the high-voltage generator includes a shield electrode electrically connected intermediate of a first voltage multiplier and a second voltage multiplier. The electron beam apparatus includes control photodetectors and photo emitters having a transparent conductive shield arranged therebetween. The rotary vacuum seal includes a pumpable chamber at a position intermediate between high-pressure and low-pressure ends of a bore for a rotating shaft. The rotary target assembly is configured such that when a torque between a bearing housing and a vacuum housing exceeds a predetermined torque, the bearing housing rotates relative to the vacuum housing. The rotary x-ray emission target has a plurality of target plates supported on a hub, the plates being arranged on the hub to provide an annular target region about an axis rotation of the hub. The x-ray gun is provided with a shield electrode maintained at a potential difference relative to the x-ray target different to the electron beam emission cathode.