|
|
|||
|
|
|||
|
From moxtek.com
The electron field-emission properties of carbon nanotubes enable the fabrication of cold cathodes for a variety of vacuum device applications. The utilization of these cathodes is an attractive alternative for the replacement of thermionic or hot cathodes for generating X-rays. Miniature X-ray tubes have been fabricated using triode-style carbon nanotube-based cathodes. In this paper we report the results of characterization studies, such as beam current dependence on the control gate voltage. Also, results on focal spot measurements and electron-beam modeling allow the possibility of reducing focused spot sizes. Driving gate voltages below 1000 volts for easy pulsing has been achieved, and the extended lifetime data suggests that a regulated power supply would be ideal for a constant AC operation mode. The 1mm focal spot size achieved so far is suitable for most XRF applications. A new X-ray tube design utilizing carbon nanotube (CNTs) cold cathodes may be a significant advance in X-ray technology development and could lead to portable and miniature X-ray sources for medical and industrial applications.
Products & Services
X-ray tubes and sources are lamps that produce X-rays.
X-ray instruments and X-ray systems use penetrating X-rays or gamma radiation to capture images of the internal structure of a part or finished product.
X-ray fluorescence spectrometers (XRFs) use a spectroscopic technique that is commonly used with solids, in which X-rays are used to excite a sample and generate secondary X-rays.
X-ray diffraction instruments are used to measure crystal structure, grain size, texture and/or residual stress of materials and compounds through interaction of the X-ray beam with a sample.
Collimators are optical lens assemblies that take divergent or convergent incoming light rays and produces parallel light output.
Product Announcements
Topics of Interest
End-window transmission-target X-ray tubes are designed for very close anode-to-sample coupling for compact portable XRF instruments. Several recent improvements have been achieved to make these tubes...
(Read More)
A test bench instrument constructed at MOXTEK, Inc. is capable of simultaneously capturing X-ray diffraction (XRD) and X-ray fluorescence (XRF) information using a charge-coupled device (CCD) as the...
(Read More)
Carbon nanotubes are fullerene-type structures which consist of graphene cylinders closed at either end. A nanotube can be thought of as a hexagonal network of carbon atoms that has been rolled up to...
(Read More)
Nanotubes are toroidal-shaped fullerene molecules or strings of C60 carbon molecules stacked into a nanosized carbon tube shape. Depending on their structure, nanotubes can serve as conductors that...
(Read More)
An X-ray shielded test chamber has been designed and built that includes a CCD-pinhole camera and energy-dispersive silicon PIN-diode detector for spectrum collection. The use of this chamber is an...
(Read More)
Technical Articles
|
|
