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Strontium-90 and Cesium-137 in Milk and Certain other Materials Collected in Finland

Department of Agricultural Chemistry, Macdonald College of McGill University, Macdonald College P.O., Province of Quebec, Canada
Radation Protection Division, Department of National Health and Welfare, Ottawa, Canada
Department of Agricultural and Forest Zoology, University of Helsinky, Finland

ABSTRACT

Sixty samples of human milk, 18 of bovine milk, 15 of reindcer milk, 1 of reindeer meat, and different lichens, all collected in Finland, were analyzed for ⁹⁰Sr, and ¹³⁷Cs. Reindeer milk contained the most ⁹⁰Sr, being 119 pCi per liter. Only 5 samples of human milk had detectable amounts of ⁹⁰Sr and 4 came from north of Oulu. Human milk from north and south of Oulu contained 114 and 19.7 pCi per liter of ¹³⁷Cs whereas bovine milk from the same regions contained 125 and 84 pCi per liter of ¹³⁷Cs. Reindeer milk from Lapland contained 1,647 pCi per liter of ¹³⁷Cs which is 13 to 14 times more than that of human and bovine milk from the same area. A specimen of dried reindeer meat contained per kilogram, 237 pCi of ⁹⁰Sr and 76,124 pCi of ¹³⁷Cs. A sample of lichen, Cladonia species, contained 1,361 pCi of ⁹⁰Sr and 21,173 pCi of ¹³⁷Cs per kilogram.