Contents Page Introduction Radiation readings on the islands of Rongelap and Ailinginae Atolls Procedures used in collecting and processing samples’ and recording radioactivity - Rate of decline of radioactivity in food items Evaluation of radioactivity in the biological samples Fish Invertebrates Land plants Algae Birds Plankton Water . 13 13 19 26 33 37 43 46 50 55 60 64