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.

The effect of pH on hyperthermic and x ray induced cell killing

Abstract: Chinese hamster ovary cells in vitro were heated (42.5°C) before, during, or after X-irradiation (5 Gy). First, a slight degree of radioprotection was observed when cells were irradiated in acidic medimn compared to irradiation in alkaline medium; i.e., 10 Gy reduced survival to 0.0035 at pH 6.75 compared to 0.0010 at pH 7.45. Second, survival increased independent of pH as the time between irradiation and subsequent heat treatment was increased. Third, both heat treatments alone and combined heat and irradiation treatments in acidic medium produced more cell killing than treatments in alkaline medium; the amount of recovery from heat damage which subsequently interacted with radiation damage decreased as the pH was decreased from 7.40 to 6.70. Furthermore, inhibition of recovery was reflected primarily as an increase in the slope of the radiation survival curve; i.e., heating for 60 min 150 min before irradiation decreased the D 0 from 1.00 Gy for cells heated and irradiated under alkaline conditions ad to 0.70 Gy for cells treated under acidic conditions. The extravolation numbers were 5 and 6 for the respective curves.

Benchmark on hydrogen distribution in a containment based on the OECD-NEA THAI HM-2 experiment

Abstract: Within the course of a hypothetical severe accident in a nuclear power plant, hydrogen can be generated in the primary circuit and released into the containment. Considering the possibility of a de...

Ising-Kondo Lattice With Transverse Field: A Possible F-Moment Hamiltonian for URu2Si2

Abstract: We study the phase diagram of the Ising-Kondo lattice with transverse magnetic field as a possible model for the weak-moment heavy-fermion compound ${\mathrm{URu}}_{2}$${\mathrm{Si}}_{2}$, in terms of two low-lying f singlets in which the uranium moment is coupled by on-site exchange to the conduction-electron spins. In the mean-field approximation for an extended range of parameters at half-filling, we show that the conduction-electron magnetization responds logarithmically to f-moment formation due to nesting; the ordered moment in the antiferromagnetic state is anomalously small, and the N\'eel temperature is of the order observed, though agreement for both of these quantities is not attained simultaneously. The model gives a qualitatively correct temperature dependence, but not magnitude, of the specific heat. The majority of the specific-heat jump at the N\'eel temperature arises from the formation of a spin gap in the conduction-electron spectrum. We also discuss the single-impurity version of the model and speculate on ways to increase the specific-heat coefficient. In the limits of small bandwidth and of small Ising-Kondo coupling, we find that the model corresponds to anisotropic Heisenberg and Hubbard models, respectively. \textcopyright{} 1996 The American Physical Society.