1977 年 26 巻 288 号 p. 863-867
The energy dispersive X-ray fluorescence technique was successfully applied to a sedimentation method to analyze particle size of each component in powder mixtures. The most simple technique is the measurement of the fluorescent X-rays from a deposit through the bottom window of a sedimentation cell. In this case, however, it is difficult to get the high sensitive and precise analysis especially for minor components because of limitation in thickness of deposit due to the self absorption. In order to facilitate the analysis in wide ranges of sample quantity, component concentration, atomic number, and particle size, two types of apparatuses were devised.
(1) Deposit transfer type; a thin film as a belt extending at the bottom of the cell is incorporated to remove the deposit whose quantity reaches to a limit, and the measurement is successively performed in real time.
(2) Fraction preparation type; a top-sealed and bottom-opened cell is moved in a vessel filled with the liquid, and thus prepared deposits are taken out from the liquid, as specimens directly usable to the X-ray analysis. Applications were made to analysis of airborne particulates and rock powders, and to investigation of the component behavior in a slurry mixture.