Abstract:
본 발명에 따른 나노포커스 X 선관은 타깃(2)과 전자빔을 상기 타깃(2)으로 향하게 하는 수단을 포함한다. 본 발명에 따라 상기 타깃(2)은 타깃 재료로 이루어진 , X선을 방출하기 위한 적어도 하나의 타깃 소자(6)를 포함하고, 상기 타깃 소자는 마이크로구조화 기술에 의해, 지지체 재료로 이루어진 지지체 소자(4)에 형성된, 약 1000 nm 이하의 직경을 가진 나노 구조체로 형성되고, 상기 타깃 소자(6)는 상기 지지체 소자(4)를 부분적으로만 커버하고, X선관(20)의 작동시 전자빔의 횡단면은, 전자빔(28)이 타깃 소자(6 또는 22 또는 24 또는 26)에 항상 완전 평면으로 방사되도록 타깃 소자(6)의 횡단면보다 크게 선택된다. 본 발명에 따라, 상기 지지체 재료는 다이아몬드이거나 또는 다이아몬드를 포함하고, 상기 다이아몬드는 전기 도전성을 높이기 위해 도핑된다.
Abstract:
Systems and methods in accordance with embodiments of the invention generate tunable electromagnetic waves using carbon nanotube-based field emitters. In one embodiment, a CNT-based irradiator includes: at least one CNT-based cathode, itself including: a plurality of carbon nanotubes adjoined to a substrate; a plurality of anodic regions; where each anodic region is configured to emit a distinctly different class of photons in a direction away from the at least one cathode in response to a same reception of electrons; where each of the plurality of anodic regions is operable to receive electrons emitted from at least one of said at least one CNT-based cathode; and where each of the at least one CNT-based cathode and the plurality of anodic regions are disposed within a vacuum encasing.
Abstract:
본 발명은 두 가지 이상의 특성엑스선을 동시에 발생시키거나 특정한 특성엑스선을 선택적으로 또는 두 가지 이상의 특정한 특성엑스선을 각각 연속해서 발생시킴으로써 용도에 적합한 다양한 특성엑스선을 발생시킬 수 있고, 전자빔과 다중 타겟의 충돌에 의해 회전 양극에서 발생하는 열의 방열효율을 높여 고휘도의 특성엑스선을 장시간 발생시킬 수 있는 다중타겟 및 다중전자빔을 구비한 엑스선 발생장치를 제공함에 있다. 이를 구현하기 위한 본 발명은, 음극 필라멘트(230)로부터 방출된 전자빔이 양극의 다중 타겟(330)에 충돌 및 반사되어 엑스선을 방출하도록 내부에 진공실(120)을 구비하는 케이스(100); 상기 케이스(100)의 내부 일측에 구비되며, 인가되는 전압에 의해 가열되어 전자빔을 방출하는 복수의 필라멘트(230a,230b,230c)로 구성된 다중 음극 필라멘트(230)를 구비하는 음극부(200); 상기 복수의 필라멘트(230a,230b,230c)에 각각 대응하도록 회전 양극 원통부(310)의 외주면 둘레에 축방향으로 이격되어 복수로 구비되며, 서로 다른 원소로 이루어진 타겟(330a,330b,330c)으로 구성된 다중 타겟(330)을 구비하는 양극부(300); 및 상기 전자빔의 충돌 시 상기 양극부(300)에서 발생하는 열을 상기 케이스(100)의 외부로 방열하기 위한 냉각부(400);를 포함하여 구성된다.
Abstract:
An anode (30) is formed by building a carbon, such as a carbon reinforced carbon composite, or other ceramic substrate (50). A ductile, refractory metal is electroplated on the ceramic substrate to form a refractory metal carbide layer (52) and a ductile refractory metal layer (54), at least on a focal track portion (36). A high-Z refractory metal is vacuum plasma sprayed on the ductile refractory metal layer to forma vacuum plasma sprayed high-Z refractory metal layer (56), at least on the focal track portion.
Abstract:
The present invention relates to X-ray generating technology in general, in particular, it relates to an anode disk element (1) for an X-ray generating device (21). The generation of electromagnetic radiation may be considered to be quite inefficient, since a substantial part of energy applied to a focal track is converted to heat rather than X-radiation. Thus, a limiting factor in the operation of X-ray tubes is the cooling of the anode element and more specifically the focal track. In the present invention, an anode disk element is provided, with an improved dissipation of heat from the focal track. Thus, the anode disk element may sustain increased heat while maintaining structural integrity. The anode disk element (1) comprises at least a first surface (2) and a second surface (3), with the first surface (2) comprising a focal track (4) and the second surface (3) comprising a conductive coating (5). The anode disk element (1) is rotatable about a rotational axis (6) with the focal track (4) being rotationally symmetrical to the rotational axis (6). The first surface (2) comprising the focal track (4) and the second surface (3) comprising the conductive coating (5) are adjacently arranged.
Abstract:
The present invention is related to high power X-ray sources, in particular to those ones that are equipped with rotating X-ray anodes capable of delivering a much higher short time peak power than conventional rotating X-ray anodes according to the prior art. The herewith proposed design principle thereby aims at overcoming thermal limitation of peak power by allowing extremely fast rotation of the anode and by introducing a lightweight material with high thermal conductivity (2) in the region adjacent to the focal track material (4). The extremely fast rotation is enabled by providing sections of the rotary anode disk made of anisotropic high specific strength materials with high thermal stability (1, 3, 6) which will be specifically adapted to the high stresses building up when the anode is operated, as for example fiber-reinforced ceramic materials. An X-ray system equipped with a high peak power anode according to the present invention will be capable of high speed image acquisition with high resolution and high coverage. Such a high-speed rotary anode disk can advantageously be applied in X-ray tubes for material inspection or medical radiography, for X-ray imaging applications which are needed for acquiring image data of moving objects in real-time, such as e.g. in the scope of cardiac CT, or for any other X-ray imaging application that requires high-speed image data acquisition. According to a further exemplary embodiment, the invention is directed to a rotary anode disk divided into distinct anode segments (10a, 10b) with adjacent anode segments which may e.g. be limited to each other by straight radial (14a) or S- shaped slits (14b) ranging from the inner anode bulk (1) to the inner radial edge of the anode disk's outer frame section (3). Other exemplary embodiments of the present invention relate to a rotary anode disk structure design which comprises liquid metal conductors (16a) between the inner anode bulk (1) and a rotary shaft (12) needed for rotating the rotary anode disk about its rotational axis (5), said liquid metal conductors (16a) providing a liquid metal connection between the rotary anode and its rotary shaft (12), or to a rotary anode disk structure which comprises a sliding radial connection (17) and a flexible heat conductor (18) between the inner anode bulk (1) and the rotary shaft (12).
Abstract:
Provided are an X-ray source for emitting a characteristic X-ray, and a fluorescent X-ray analyzing device using the X-ray source. A secondary target (119) is superimposed on a primary target (118). An electron beam (115) generated by an electron gun (114) is incident on the primary target (118), and this primary target (118) transmits and emits a continuous X-ray. The second target (119) transmits and emits a characteristic X-ray (121), which is excited with the continuous X-ray emitted from the primary target (118). The primary target (118) and the secondary target (119) are superimposed to make the continuous X-ray emitted from the primary target (118), efficient for the excitation of the secondary target (119) thereby to generate the characteristic X-ray (121) efficiently.
Abstract:
X-ray targets made of a single foil alloy, eutectic alloy, compound or intermetallic compound of at least two elements to produce separate line emissions from at least two different elements in the foil, to reduce the reactivity in air or moisture compared to at least one of the said elements producing useful x-rays, or to increase the producing useful x-rays are provided. X-ray targets made by simultaneous deposition of more than one material altering the coefficient of heat transfer compared to layering of said materials are provided. Transmission x-ray tubes configured for use in fluoroscopy by focusing the electron beam onto a small spot on the target or by using a thick target foil to reduce background x-ray noise in measuring an element of interest wherein a second optional thin foil is layered onto the thick target foil to produce excitation energy for the measured element are provided. Transmission x-ray tubes coupled to a single capillary or a bundle of capillaries are also provided.
Abstract:
A miniature x-ray tube has an anode assembly capable of transmitting x-rays through the anode and over a wide angular range. The anode (62) is in the shape of a cone or truncated cone with an axis on the x-ray tube frame axis, formed of low Z material with high thermal conductivity for heat dissipation. A target material on the anode body is in a thin layer (20), which may be approximately 0.5 to 5 microns thick. In one embodiment a tube evacuation exhaust port (64) at the tail end of the anode assembly forms a cavity for a getter (56), with a pinched-off tubulation (48) at the end of the cavity.
Abstract:
A miniature x-ray tube has an anode assembly capable of transmitting x-rays through the anode and over a wide angular range. The anode is in the shape of a cone or truncated cone with an axis on the x-ray tube frame axis, formed of low-z material with high thermal conductivity for heat dissipation. A target material on the anode body is in a thin layer, which may be approximately 0.5 to 5 microns thick. In one embodiment a tube evacuation exhaust port at the tail end of the anode assembly forms a cavity for a getter, with a pinched-off tubulation at the end of the cavity.