Kidney stones collected from different hospitals in Chennai, south India were analyzed by PIXE with 3MeV protons. The matrix was calcium oxalate and mixture of calcium oxalate and calcium phosphate. Light elements present in minor concentration were P, Cl. Trace elements such as V, Cr, Mn, Fe, Cu, Zn, Sr, Zr & Mo were also present in the stones. Significant amount of Zr was found in one of the samples, Pb and Cd were not present in any of the stones analyzed.

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