Optical Line Radiation from Uranium Plasmas.
Abstract
The radiative energy current due to line radiation is calculated in a U 235 plasma over a temperature range of 5000 K to 8000 K. Also a variation in the neutron flux of 2 x 10 to the 12th power neutrons/ (sq cmsec) to 2 x 10 to the 16th power neutrons/(sq cmsec) is considered. The plasma forms a cylinder with a diameter and height of one meter. To calculate the radiativeenergy current, a rate equation formalism is developed to solve for the atomic state densities along with a model for the energy levels in neutral and singly ionized uranium. Because the electron states in uranium lie below 5eV, recombination is the principle excitation mechanism. At and above 6000 K, inversions were found, and at all temperatures the line radiation at line center was greater than the corresponding blackbody radiation. There are negligible differences in the radiativeenergy current at 6000 K for variations in the neutron flux. The average opacity, which varied from 100 to 100,000 gm/sq cm, over the frequency range of line radiation is calculated.
 Publication:

Ph.D. Thesis
 Pub Date:
 1977
 Bibcode:
 1977PhDT........26M
 Keywords:

 Physics: Radiation; Energy;
 Atomic Energy Levels;
 Gaseous Fission Reactors;
 Line Spectra;
 Plasma Spectra;
 Uranium Plasmas;
 Neutron Flux Density;
 Plancks Constant;
 Radiative Transfer;
 Reactor Cores;
 Uranium 235;
 Nuclear and HighEnergy Physics