The measurement of temperature dependent thermal neutrons in water using a crystal detector
Bennett, Robert Gordon
MetadataShow full item record
This research was concerned with the temperature dependence of thermal neutron flux. In view of the excellent neutron detection capability exhibited by the Lithium Iodide Europium crystal this phosphor was utilized for the investigation. A miniature crystal (4 mm X 4 mm) and a flexible light pipe combination were used to determine the neutron spatial distribution as a function of temperature using a Pu-Be source in a light-water medium. A separate experimental investigation, with Indium foils and activation analysis, was used to determine the temperature dependence of thermal neutron flux under the same experimental conditions as the crystal. A theoretical analysis was also conducted using Two-Group theory to obtain an expression for thermal flux with spatial and temperature dependent parameters. The results of the research indicates that the thermal neutron flux is temperature dependent in the region of temperature investigated (77 degrees - 168 degrees F). The experimental results verify the increasing trend of flux magnitude with increasing temperature, as predicted by the Two-Group solution.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
A simplified cell theory applied to the calculation of thermal neutron spectra in light water lattices MacVean, Charles Robert (Ithaca, New York; Cornell University, 1964-09);A simplified polyenergetic cell theory is formulated to determine spatially averaged energy dependent thermal fluxes in the moderator, cladding, and fuel regions within the unit cell of a reactor lattice. The derived ...
Electron paramagnetic resonance studies of molecular orientation and nuclear exchange in single crystals of morphine N-oxide. Weerts, Gary Lee (Monterey, California ; Naval Postgraduate School, 1971-12);Low temperature (-150°C) EPR spectra of the nitroxide generated photolytically in a single crystal of N-nitromorpholine are complicated by the presence of two magnetically distinct orientations of the N-0 bond within ...
Hammerer, John J. (1988);Neutron irradiation of high temperature superconductors was performed in order to determine the effects of nuclear weapons on these novel materials. This radiation could also be encountered in space radiation belts, fusion ...