Analysis of ultrasonic effect on powder and application to radioactive sample compaction

Abstract

The effect of ultrasound on powder compaction was analyzed. The decreasing in the friction coefficient of the powder sample is derived theoretically. The compaction rate was improved by the ultrasound. We applied the effect to the compaction of environmental radioactive soil samples. From γ-ray spectroscopy analysis, more radionuclides could be detectable in the sample compacted with ultrasound.

High power ultrasonic effect on soil compaction for different static pressure

“…[7][8][9][10][11][12][13][14] In a previous study, we suggested the theoretical model for analyzing the effect of ultrasound on powder compaction. 15) The decrease in the friction coefficient of the powder sample caused by ultrasound was confirmed theoretically and experimentally under constant static pressure. However, in that model, the change in static pressure was not taken into consideration, and the compacting effect could be different if the static pressure was changed.…”

“…Generally, the powder compaction is performed with ultrasonic vibration as well as high static pressure. Recently, we suggested a theoretical analysis of the ultrasonic effect on the powder compaction 4) . In this study, to analyze the improvement of compaction caused by ultrasonic vibration under various static pressure appling to the powder, the effective friction coefficient and sound speed of the powder are examined theoretically and experimentally.…”