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Transfer of Fallout Cesium-137 from Soil to Dairy Cattle Feeds¹

ABSTRACT

Corn (Sorghum vulgare) seedlings were grown in a greenhouse in the upper 5 cm of soil taken from a permanent pasture containing a cumulative fallout deposition of Cs¹³⁷ of 80,000 pc/m². No detectable Cs¹³⁷ (< 10 pc/kg) was found in the plants. On the other hand, corn plants growing in local fields contained 1,500 pc/kg of Cs¹³⁷. It was concluded from these studies that the Cs¹³⁷ content of dairy cattle feeds resulted largely from direct foliar contamination, and that uptake from the soil reservoir was unimportant. Further, the comparable alfalfa hay crops in years since 1963 have been decreasing in Cs¹³⁷ level, while the top soil Cs¹³⁷ concentration has increased steadily during this period.

¹ Published with the approval of the Director of the Colorado Agr. Exp. Sta. as Scientific Series Paper no. 1059.

² Assistant Professor Radiation Biology, Jr. Animal Scientist, and Associate Professor Soils, respectively, Colorado State University, Fort Collins.

Received for publication January 3, 1966. Accepted for publication March 29, 1966.