DEPTH DISTRIBUTION PLUTONIUM-239 AND CESIUM-137 AT ROCKY FLATS PERCENT OF ACTIVITY IN TOP 10-cm PRESENT ABOVE THE INDICATED DEPTH I Pu-239 @ MEAN +: STD DEV. - 3 Cs-137 ae T 5 —_ oa PERCENTOF ACTIVITY (0 to 10cm) ABOVE THE INDICATED DEPTH 80= DEPTH (cm) Fig. 7 663 10