SLIDE 9 Surface activity based on soil analysis. Surface soil activity measurements are important because they may be related to activity on the Zround at the cessation of fallout if the soils are undisturbed, or if disturbances can be accounted for. Surface soil samples were removed from Rongelap, Utirik and other atolls in the Marshall Islands during the period 1955 to 1977. Samples were stored at the University of Washington's Applied Fisheries Laboratory. The surface soil samples were taken at depths up to two inches. Soil sample tests for 1297 were either mid-island soils with humus, sandy soils from all parts of the island, black and white beach sands, grey powdery soils, randomly collected composites or humus-seedy mixtures. Out of the thousands of samples of this type stored at the University, several hundred were identified for neutron activation analysis by persons from BNL, Samples were packed and sent to Battelle Northwest Laboratory and analyzed by Brauer (Br80). ARCHIVAL SOIL MEASUREMENTS| PNL ANALYSIS Date 1-129 PCI/YG PCT ERR 1-127 NG/G PCT ERR CS-137 PCI/G PCT ERR EU-155 PCI/G’~ PCT ERR Comment 102255 . 8.5E-03 . 3 . 1.5E+04 ‘ 5 ‘ 3.5E+00 : 1 , 2.7E—-01 : 7 . Utirik soil, very fine, dark grey, powdery OVER 50 SOIL SAMPLES WERE ANALYZEDFOR '*1,1,sp, 87s, ™ Bu, © Co,