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

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Title: Anomalous X-ray transmission changes in copper crystals on electron irradiation at 14 K
Author(s): Brown, Bruce Stilwell
Department / Program: Physics
Discipline: Physics
Degree: Ph.D.
Genre: Dissertation
Subject(s): Copper copper crystals anomalous x-ray transmission
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.
Issue Date: 1972
Genre: Dissertation / Thesis
Type: Text
Language: English
Rights Information: © Bruce Stilwell Brown
Date Available in IDEALS: 2012-02-29
Identifier in Online Catalog: 2935692

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