[en] Common ingredients of a chewable betel-leaf preparation and commercially available tea leaves were investigated for the presence of uranium traces using the fission track technique. Most of the results ranging from 0.012 to 0.046 ppm uranium correspond to α-activity in the range of 0.008-0.031 pCi/g. The single higher result for lime (used in the betel-leaf preparation) of 0.53 ppm, indicates an α-activity of 0.35 pCi/g. This range of uranium concentrations is similar to that found for other biological materials, foods and tobacco. Although it is lower than concentrations of some other α-emitters, e.g. ²²⁶Ra and ²³²Th in cereal grains and nuts, the notably high U concentration (50-100 times that of cigarette tobacco) and the high concentration of other trace elements in betel leaves may be potentially hazardous when used frequently in large amounts. (author)