LETHAL EFFECT OF ABSORBED RADIOISOTOPES ON PLANTS

Abstract
The lethal does of P32 and Sr90 for wheat, barley, and sunflower seeds is approx. 1.4 microcuries per seed (0.05 rd.). Radioautographs indicate that at 5 wks.'' growth the distribution of P in a wheat plant is fairly uniform whereas that of Sr is very uneven, practically all the strontium being concentrated in the first 2 leaves.

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