Geometrical model for calculating the effect of surface morphology on total x-ray output of medical x-ray tubes.

Purpose: Correlation of characteristic surface appearance and surface roughness with measured air kerma (kinetic energy released in air) reduction of tungsten-rhenium (WRe) stationary anode surfaces.

Methods: A stationary anode test system was developed and used to alter nine initially ground sample surfaces through thermal cycling at high temperatures. A geometrical model based on high resolution surface data was implemented to correlate the measured reduction of the air kerma rate with the changing surface appearance of the samples.

Grain boundary study of technically pure molybdenum by combining APT and TKD.

Molybdenum is an eligible material for high performance applications. However, its applicability is limited because of a brittle-to-ductile transition around room temperature, depending on the grain size and the content of interstitial impurities present at grain boundaries. The total amount of impurities in the current quality of molybdenum has become very small in the last decades.