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