Sumerling T J
Sci Total Environ. 1981 Dec;22(1):39-50. doi: 10.1016/0048-9697(81)90080-2.
Sea water contaminated with diluted radioactive effluent from the Windscale nuclear complex in Cumbria periodically floods low-lying grazing pasture around the estuaries of the rivers Esk, Irt and Mite near Ravenglass. During 1979, an experiment was carried out to measure the transfer of caesium-137 from grass to muscle in cows grazing these pastures. Grass samples were taken in a vivo external gamma-ray measurements were made on cattle. A very low transfer coefficient was found, less than 9 X 10-4 days kg-1 with a best estimate of 4 X 10-4 days kg-1, compared with a more usual value of around 3 X 10-2 days kg-1. The low transfer seems to occur because the bulk of the caesium-137 on the grass is bound to resuspended estuarine surface sediment deposited during flooding. In this form, the caesium-137 is only poorly absorbed across the gut of the grazing cattle.
受坎布里亚郡温斯凯尔核设施稀释后的放射性废水污染的海水，会周期性地淹没雷文格拉斯附近埃斯克河、厄特河和迈特河河口周边的低洼放牧牧场。1979年期间，开展了一项实验，以测量在这些牧场放牧的奶牛体内铯 - 137从草到肌肉的转移情况。采集了草样，并对牛进行了活体外部伽马射线测量。结果发现转移系数非常低，小于9×10⁻⁴天·千克⁻¹，最佳估计值为4×10⁻⁴天·千克⁻¹，而更常见的值约为3×10⁻²天·千克⁻¹。转移系数低似乎是因为草上的大部分铯 - 137与洪水期间沉积的河口悬浮表层沉积物结合在一起。以这种形式存在的铯 - 137在放牧牛的肠道中吸收很差。
