Strontium is a soft, silvery metal with a number of uses: It blocks X-rays emitted by TV picture tubes; it causes paint to glow in the dark; and it is responsible for the brilliant reds in fireworks.

Measurements were made of the concentrations of calcium, strontium, barium, Ra²²⁶ and Ra²²⁸ in ammonium acetate extracts of soil, and wheat plant tissues, from three sites. The ratios of strontium to ...