10,000 o ° RADIOACTIVITY 1000 | 200 19000 |, 1954 MAR. DAYS AFTER Radioactive decay Figure 3. patterns of plankton samples from Rongelap Lagoon. 1. 2. 3. 4. 5. 6. Plate Plate Plate Plate Plate Plate 19020, Labaredj, 12/18/54 19029, Kabelle, 1,/29/55 19025, Rongelap, 1/26/55 6079, Kabelle, 7/24/56 6076, Rongelap, 7/23/56 6077, Rongelap, 7/23/56 (68.