Chalk River Laboratories

About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.

A measurement of the half-lives of 54Mn, 57Co, 59Fe, 88Y, 95Nb, 109Cd, 133Ba, 134Cs, 144Ce, 152Eu

Abstract: The half-lives of ten gamma-ray-emitting radionuclides have been measured using a reentrant well (4πγ) ionization chamber measuring system to follow the gamma-ray output of sources. The half-lives determined were: 54 Mn, 312.11 ± 0.05 d; 57 Co, 271.68 ± 0.09 d; 59 Fe, 44.472 ± 0.008 d; 88 Y, 106.65 ± 0.13 d; 95 Nb, 34.997 ± 0.006 d; 109 Cd, 460.2 ± 0.2 d; 133 Ba, 3848.9 ± 0.7 d; 134 Cs, 754.5 ± 0.2 d; 144 Ce, 286. 14 ± 0.09 d; and 152 Eu, 4948 ± 7 d. The quoted uncertainties combine components of Type A and Type B equivalent to one standard deviation.

Neutron-diffraction measurements of stress

Abstract: Experiments on bent steam-generator tubing have shown that different diffraction peaks, (1 1 1) or (0 0 2), give different results for the sign and magnitude of the stress and strain. From an engineering standpoint, the macroscopic stress field cannot be both positive and negative in the same volume, so this difference must be due to intergranular effects superposed on the macroscopic stress field. Uniaxial tensile test experiments with applied stresses beyond the 0.2% offset yield stress, help to understand this anomaly, by demonstrating the different strain response to applied stress along different crystallographic axes. When Zr-alloys are cooled from elevated temperatures, thermal stresses always develop, so that it is difficult to obtain a stress-free lattice spacing from which residual strains may be derived. From measurements of the temperature dependence of lattice spacing, the temperature at which the thermal stresses vanish may be found. From the lattice spacing at this temperature the stress-free lattice spacings at room temperature can be obtained readily. To interpret the measured strains in terms of macroscopic stress fields it is necessary to know the diffraction elastic constants. Neutron diffraction measurements of the diffraction elastic constants in a ferritic steel for the [1 1 0], [0 0 2] and [2 2 2] crystallographic axes, in directions parallel and perpendicular to the applied stress are compared with theoretical diffraction elastic constants.