Method for successively performing an analysis powder diffraction of at least two powder samples which are contained in carrier media sample, in which use of an apparatus (1, 20) comprising becomes: - a source (2) radiation is adapted to direct a radiation beam (3) to a powder sample, - a detector (8) for detecting radiation diffraction in a powder sample, - actuator means (5, 21) for movement of a powder sample irradiated during irradiation and detection with respect to the radiation beam, wherein said method comprises the steps of: irradiating a powder sample and detecting radiation diffraction powder sample, arranging another sample powder such that said radiation beam is directed to the other of said powder sample, and irradiating said further powder sample and detecting radiation diffraction of said other sample, wherein during irrad i ng and detecciónde each sample, the actuator means effect a movement of the irradiated sample with respect to the beam of radiation to improve statistical particle, wherein the carrier means displays comprise a common carrier (6) for multiple samples maintaining said at least two samples (7) of powder, characterized in that, the actuating means (5, 21) are connected to said common carrier (6) of multiple samples, and in that said actuating means made, during irradiation and detection of a sample contained in said common multiple samples holder, a movement of said common multiple samples holder with respect to the radiation beam.
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