University of Illinois Urbana-Champaign

Anomalous X-ray transmission changes in copper crystals on electron irradiation at 14 K

Brown, Bruce Stilwell

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https://hdl.handle.net/2142/29949

Description

Title
Anomalous X-ray transmission changes in copper crystals on electron irradiation at 14 K
Author(s)
Brown, Bruce Stilwell
Issue Date
1972
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Copper
  • copper crystals
  • anomalous x-ray transmission
Language
en
Abstract
Anomalous X-ray transmission measurements were made at.4,2 K on nearly perfect crystals before and after irradiation at 14 Kwith 3 MeV electrons, Simultaneous resistance measurements were taken on high purity copper wires, The measured intensity changes for (111), (222), (333), (220), (200), and (400) reflecting planes were investigated at intervals during the irradiation, Annealing studies at 22 K, 37 K, 78 K, and 295 K show X-ray intensity recoveries similar to resistance recoveries. Resistance increases show a linear dependence with electron fluence while transmitted X-ray intensity decreases show a greater than linear dependence. Resistance changes with dose were comparable with previous data, X-ray intensity decreases appear to be greater than predicted for the estimated concentration of point defects, A second irradiation of the transmission specimen after a long room temperature anneal led to decreases in transmitted intensity which were about twice the changes seen after a similar electron fluence in the first irradiation.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/29949
Copyright and License Information
© Bruce Stilwell Brown

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