摘要:
A structure including a substrate, an intermediate layer provided and formed directly onto the substrate, a transition region, and a group II-VI bulk crystal material provided and formed as an extension of the transition region. The transition region acts to change the structure from the underlying substrate to that of the bulk crystal. In a method of manufacture, a similar technique can be used for growing the transition region and the bulk crystal layer.
摘要:
A method and system for facilitating the identification and/ or authentication of objects, and to a method and system for the marking of objects with an identity and/ or as of authentic origin, anda set of objects marked to facilitate subsequent identification and/ or authentication are described. The marking comprises incorporating into an object or part thereof or onto a tag mechanically engaged therewith a marker material exhibiting a characteristic radiation interaction response to incident high- energy ionizing radiation from a test source that is known to vary spectroscopically across the spectrum of the source. The presence or otherwise of the marker material may be determined by subsequent interrogation of an object with a suitable radiation source and detector to infer whether an object is of marked identity or origin.
摘要:
A detector device is described comprising an x-ray detector structure having a detection surface defining at least one separately addressable region for detecting incident x-ray radiation intensity thereon, wherein the separately addressable region is divided into a plurality of sub-regions provided on the detection surface each provided with a filter layer on the detection surface, the filter layers of a given separately addressable region comprising discrete and different materials with discrete defined and spectroscopically spaced x-ray absorption edges. A method of device manufacture, and an apparatus and method for the inspection and characterisation of materials employing such a detector device, are also described.
摘要:
A tracking device for tracking with a radioactive material, a container including such a device, a system using such devices, and a tracking method are described. The device has a radiation detector (10) associatable with a radioactive material (14) adapted to be placed in use within a container (1) defining a radiation-shielded enclosure (7) for containing a radioactive material, to detect radiation activity from the material (14); a RF identification module (12) associatable with the container (1), comprising a data register to store a unique product identification code, a processor with a data transfer link (11) to each of the radiation detector (10) and data register to receive and process a live data stream of activity data from the detector (10) and associate this with the unique product identification code in a processed data packet, and an antenna (13) to enable transmission of a data item comprising both the unique product identification code and processed activity data to a remote data capture means (16), at least the antenna (13) being adapted to sit outside the radiation-shielded enclosure.
摘要:
The present invention relates to an apparatus for vapour phase crystal growth to produce multiple single crystals in one growth cycle comprising one central source chamber, a plurality of growth chambers, a plurality of passage means adapted for transport of vapour from the source chamber to the growth chambers, wherein the source chamber is thermally decoupled from the growth chambers.