Accession Number : ADA308084
Title : Parametric X-Radiation From Mosaic Graphite: New Results and Reconciliation of Previous Experiments.
Descriptive Note : Master's thesis,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Barrows, James E.
PDF Url : ADA308084
Report Date : MAR 1996
Pagination or Media Count : 107
Abstract : This thesis explores the effects of mosaic graphite on the yield of parametric x-radiation (PXR). PXR is the Bragg scattering of virtual photons associated with the Coulombic field of relativistically charged particles interacting with the atomic planes of a crystal. PXR was measured from three samples of mosaic graphite crystals with differing mosaicities. The number of photons per electron was calibrated with the fluorescent x-ray yield from a thin silver foil backing on each of the mosaic crystals. The detector angular field of view was narrowed from previous experiments. Improvements were made in the re-analysis of previous experiments by considering the thick target effects of the x-ray absorption. Previous experiments had erroneously assumed that the calibration fluorescent targets were thin. Re-analysis of previous data using corrections for solid angle, crystal absorption factors and effective thickness resulted in yields similar to those obtained in this work.
Descriptors : *MATRIX MATERIALS, *X RAY ABSORPTION ANALYSIS, FLUORESCENCE, THESES, GRAPHITE, CRYSTALS, CHARGED PARTICLES, ELECTRONS, RADIATION ABSORPTION, SAMPLING, PHOTONS, X RAY SCATTERING, THINNESS, CALIBRATION, FOILS(MATERIALS), SILVER, BRAGG SCATTERING.
Subject Categories : Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE