Comparison of natural & fallout radioactivity in Ontario soils under pine

Eville Gorham

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Radioactive fallout was strongly concentrated in the organic litter layers of pinewood soils which exhibit gross ( beta -activities as high as or higher than those of living pine needles. Radioactivity of the ash from litter layers sampled in spring 1962 after resumption of nuclear tests by Russia was about 12 times that exhibited .in the early months of 1961 & about 30 times the natural beta activity before there was worldwide thermonuclear fallout. Mineral soils sampled during the same periods generally showed only slight differences in ash activity. Leaf litter from angiosperm trees was more highly radioactive than litter from gymnosperm trees on both the ash & dry weight basis.
Original languageUndefined/Unknown
Pages (from-to)1309-1318
Number of pages10
JournalCanadian Journal of Botany
Issue number9
StatePublished - 1963


  • Bioaccumulation of radioactive fallout

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