OFFICIAL USE ONLY II. GROSS ACTIVITY D. Water Table Eighteen suggests a relatively high ratio of activity associated with the filtrate which is perhaps not umexpected since the fallout material consisted principally of calcium oxide and calcium carbonate. h 2 2 Tables Fifteen , Eighteen and Nineteen show the gross activity found in water sources. Table Twenty the analyses by HASL. 6 OFFICIAL USE ONLY 5002114 Das =