Two dimensional vacancy map measurement by a positron microprobe

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Positron probe microanalyzer (PPMA) for two-dimensional defect map has been developed. We have succeeded in extracting the magnetically-guided positron beam from the magnetic field and enhancement of brightness of the positron beam in transmission geometry. The present beam size was estimated to be 14.5 μm. This method has been applied to the study of the deformation-induced defect in pure iron. It has been proven that the vacancy clusters are formed at the fractured points and they can be anticipated using this technique.