摘要:
An apparatus for Flash X-ray irradiation of material includes a Flash X-ray source comprised of an electron gun and an anode. The electron gun comprises a field emission cold cathode having an electrode emitting surface, and a grid for controlling electron flow from the cathode to the anode. The anode has an electron- receiving main surface and an X-ray emitting, oppositely facing main surface. The X- ray emitting surface emits X-radiation into an irradiation volume. The X-ray emitting surface of the anode has orthogonally oriented first and second dimensions of greater than 2 millimeters each. A high voltage pulse power supply powers the Flash X-ray source. The electron gun, anode end high voltage pulse power supply are so constructed as to create sufficient X-radiation in said irradiation volume to achieve a desired level of irradiation of material in said volume.
摘要:
A structure to generate x-rays has a plurality of stationary and individually electrically addressable field emissive electron sources (402) with a substrate composed of a field emissive material, such as carbon nanotubes. Electrically switching the field emissive electron sources at a predetermined frequency field emits electrons in a programmable sequence toward an incidence point on a target. The generated x-rays correspond in frequency and in position to that of the field emissive electron source. The large-area target (404) and array or matrix of emitters (402) can image objects (416) from different positions and/or angles without moving the object or the structure (400) and can produce a three dimensional image. The x-ray system is suitable for a variety of applications including industrial inspection/quality control. Analytical instruments, security systems such as airport security inspection systems and medical imaging, such as computed tomography.
摘要:
An x-ray generating device includes a field emission cathode formed at least partially from a nanostructure (1110) containing material having an emitted electron current density of at least 4 A/cm2. High energy conversion efficiency and compact design (1100) are achieved due to easy focusing of cold cathode emitted electron between the cathode (1110) and the gate or anode (1130) and focusing the electron beams at different anode materials (1130), pulsed x-ray radiation with varying energy can be generated from a single device.
摘要:
Pulse mode X ray generator comprising a high tension source (HT), an X ray emitting head (4) capable of producing X rays when it receives an electrical pulse, a plurality of power cables (C1 to C6) disposed between the source and the head, means (S1, S2) for storing the electrical energy supplied by the source and means (TH) for releasing the electrical energy that has accumulated in the storage means and triggering the pulse which is then transferred to the head through the power cables. The power cables are wound into spirals and are connected in parallel to storage means and connected in series to the head. Applications in science, medicine and industry.
摘要:
The invention relates to a spark gap comprising a cathode (12) and an anode (11). According to the invention, said spark gap is divided into two partial spark gaps by means of a central piece (13), namely a high-pressure spark gap (14) and an effective spark gap (15) Said effective spark gap (15) can for example, be used to generate monochromatic x-rays (26). In order to guarantee a defined switching time, the high-pressure spark gap (14) which is initially switched to defined, is used. The switching initiates a potential so high on the centre piece that, when the high pressure spark gap (14) is switched, the effective spark gap (15) can also be switched in a defined manner without significant delays, to a visibly higher voltage.
摘要:
Pulse mode X ray generator comprising a high tension source (HT), an X ray emitting head (4) capable of producing X rays when it receives an electrical pulse, a plurality of power cables (C1 to C6) disposed between the source and the head, means (S1, S2) for storing the electrical energy supplied by the source and means (TH) for releasing the electrical energy that has accumulated in the storage means and triggering the pulse which is then transferred to the head through the power cables. The power cables are wound into spirals and are connected in parallel to storage means and connected in series to the head. Applications in science, medicine and industry.