The distribution of trace cesium in the manganese nodules and sediments in the North Mid-Pacific

The levels of trace cesium and activity of cesium-137 in twenty-seven manganese nodule and sediment samples were measured by absorption spectrophotometry and beta counting, respectively. Data indicate that the contents of cesium in manganese nodules and sediments ranged from 0.3 to 1.2 g/g and 0.8 to 13.0 g/g, respectively. The activity of cesium-137 was lower than the instrument detective limit, therefore it was not detected in all the samples.