The electret effect of kidney stones.

Surgically removed kidney stones were powdered and samples made from them were subjected to a d.c. field of 20-50 kV/cm whilst being heated at 1 degree C/min.

Radioactive uranium in various Indian tobaccos and consumable products (snuff, chutta, bidi and cigarette).

Tobacco is chewed in the form of snuff and thus its radioactivity--if there is any--goes directly into the body. Besides normal smoking, tobacco is also smoked in reverse manner in the form of "chutta", an indigenously prepared cigar made from the home grown plants of Nicotinia tobacum in South East coastal towns and villages in India. The burnt residue and the radioactive element--if there is any--in the case of chutta smoking will also go directly in the body causing hazardous effects.