CESIUM-137 RADIOACTIVITY IN SOIL AT ARGONNE NATIONAL LABORATORY Radioactive decay curve (Cs-137 half life = 27 yrs.) Plumbob Hardtack I Argus Hartack II • Single shot RUTHENIUM-103 RADIOACTIVITY IN SOIL AT ARGONNE NATIONAL LABORATORY Radioactive decay curve (Ru-103 half life = 40 days) |