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Influence of Age of Radioactive Fallout Material upon its Deposition in Milk and Vertical Distribution in Soil

School of Hygiene, University of Toronto, Canada

D. R. Arnott

Department of Dairy Science, Guelph Agricultural College, Guelph, Canada

ABSTRACT

The delay period between the liberation of radiostrontium and its appearance in milk, soil, and grass was studied. Milk samples showed consistently higher S.U.⁹⁰ and Strontium⁹⁰ values in October than in August, 1961, and the presence of Strontium⁸⁹ was evidence of fresh fallout, proving that the delay period was less than two months. The soil samples taken from the site where the cows grazed showed no increase of Strontium⁹⁰ and no evidence of Strontium⁸⁹. In grass, however, there was a sharp increase of both isotopes from September to November, 1961, the simultaneous rise suggesting recent pollution. The effective delay period, therefore, for fallout to be incorporated into grass was less than two months. That there was no increase in either isotopes in the soil suggests that Strontium⁸⁹ and Strontium⁹⁰ entered the vegetation by direct routes.