Abstract
The anomalous transmission of x ray's in nearly perfect copper crystals is reported. The apparent absorption coefficient of x rays becomes abnormally small when an incident beam undergoes a Bragg reflection during passage through the crystal. The incident radiation was Cu K alpha /sub 1/ monochromated by (111) reflection from a perfect silicon crystal on to the 1 cm/sup 2/ face (110) of thickness 0.05 to 1.3 mm. Apparent individual imperfections are revealed as light images in the transmitted beam image. (C.E.S.)
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