Bioelectrets of renal calculi (kidney stone)

Thermoelectrets of kidney stones, surgically removed from the patient´s body were form [3], which showed the presence of dipolar polarization. In the present communication bioelectret studies, through thermally stimulated polarization (TSP) of two different stones has been reported. It has been observed that the peak temperature of the surface and of the core of each stone appears at different temperatures. After comparing these temperatures with those of calcium oxalate and calcium phosphate, it has been concluded that the nucleus of the kidney stone is calcium oxalate, showing thereby that TSP may be helpful in estimating the composition of kidney stones.