Atomic Energy of Canada Limited

About: Atomic Energy of Canada Limited is a company organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Neutron & Zirconium alloy. The organization has 4845 authors who have published 4826 publications receiving 102951 citations.

Microbial studies in the Canadian nuclear fuel waste management program

Abstract: Atomic Energy of Canada Limited (AECL) has developed a concept for permanent geological disposal of used nuclear fuel in Canada. This concept, based on a multibarrier system, would involve disposal of nuclear fuel waste in titanium or copper containers, surrounded by compacted clay-based buffer and backfill materials, in a vault 500–1000 m deep in granitic rock of the Canadian Shield. Subsurface environments will not be sterile and an experimental program was initiated in 1991 by AECL to address and quantify the potential effects of microbial action on the integrity of the disposal vault. This microbial program focuses on answering specific questions in areas such as the survival of bacteria in compacted clay-based buffer materials under relevant radiation, temperature and desiccation conditions; mobility of microbes in compacted buffer materials; the potential for microbially influenced corrosion of containers; microbial gas production in backfill material; introduction of nutrients as a result of vault excavation and operation; the presence and activity of microbes in deep granitic groundwaters; and the effects of biofilms on radionuclide migration in the geosphere. This paper summarizes the results to date from the research activities at AECL.

Industrial material processing electron linear accelerator

Abstract: An electron linear accelerator for use in industrial material processing, comprises an elongated, resonant, electron accelerator structure defining a linear electron flow path and having an electron injection end and an electron exit end, an electron gun at the injection end for producing and delivering one or more streams of electrons to the electron injection end of the structure during pulses of predetermined length and of predetermined repetition rate, the structure being comprised of a plurality of axially coupled resonant microwave cavities operating in the π/2 mode and including a graded-β capture section at the injection end of the structure for receiving and accelerating electrons in the one or more streams of electrons, a β = 1 section exit section at the end of the structure remote from the capture section for discharging accelerated streams of electrons from the structure and an rf coupling section intermediate the capture section and the exit section for coupling rf energy into the structure, an rf system including an rf source for converting electrical power to rf power and a transmission conduit for delivering rf power to the coupling section of the structure, a scan magnet disposed at the exit end of the structure for receiving the electron beam and scanning the beam over a predetermined product area and a controller for controlling the scanning magnet and synchronously energizing the electron gun and the rf source during the pulses

A study of the relationship between lattice fringes and lattice planes in electron microscope images of crystals containing defects

Abstract: Recently several very clear lattice fringe images have been published in which the perturbing influence of lattice defects is evident in the form of bending and terminating fringes. Detailed analyses of these images have been given, based on the assumption that there exists a one-to-one correspondence between fringe distribution and lattice plane distribution. From studies of the properties of calculated images, doubt has been cast upon the validity of such a straightforward interpretation. Analysis of these calculated images suggested that a change in the diffraction geometry could produce changes in the number of terminating fringes and in the fringe bending which were not related to the lattice plane geometry in any simple way. In this paper a summary of the predicted image properties arising from the calculations is given. By examining lattice fringe images of inclined dislocations in deformed Ge, these properties are verified experimentally. As a result it is shown that it is not correct to ...