Accession Number : ADA632476


Title :   Advanced Quantification of Plutonium Ionization Potential to Support Nuclear Forensic Evaluations by Resonance Ionization Mass Spectrometry


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Lensegrav, Craig T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a632476.pdf


Report Date : Jun 2015


Pagination or Media Count : 59


Abstract : Ongoing work seeks to apply the technology of resonance ionization mass spectrometry (RIMS) to problems related to nuclear forensics and, in particular, to the analysis and quantification of the debris from nuclear detonations. As part of this effort, modeling and simulation methods are being applied to analyze and predict the potential for ionization by laser excitation of isotopes of both uranium and plutonium. Early work focused on the ionization potential of isotopes of uranium, and the present effort has expanded and extended the previous work by identifying and integrating new data for plutonium isotopes. In addition to extending the effort to this important new element, the work described in this thesis implemented more accurate descriptions of the spatial distribution of the laser beams to improve the accuracy of model predictions compared with experimental results as well as an ability to readily incorporate new experimental data as they become available. The model is used to estimate ionization cross sections and to compare the relative excitation potential for two isotopes as a function of wavelength, irradiance, and bandwidth.


Descriptors :   *IONIZATION POTENTIALS , *MASS SPECTROMETRY , *PLUTONIUM , ATOMIC PROPERTIES , BANDWIDTH , CROSS SECTIONS , EMISSION SPECTRA , EXCITATION , EXPERIMENTAL DATA , FISSION NEUTRONS , LASER BEAMS , NUCLEAR EXPLOSIONS , NUCLEAR WEAPON DEBRIS , PHOTONS , RESONANCE , SIMULATION , THESES , URANIUM


Subject Categories : Inorganic Chemistry
      Lasers and Masers
      Nuclear Weapons
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE