5.3. ANIMAL STUDIES re . cil and pathological Tifects of the exposure, as well as long torm effects on these awoatnnids, are being studied, In additfon, fertility and hatcehability studies as well as radlochendeul amd - ysis of eges laid by hens from Rongelap were performed, . These studies have provided information on the extent and nature of the tnternal contami nation in the exposed human beings. For example, radioautographs of animal bones prepared by NRDL, and Argonne National Laboratory™ (Figs. 5.3 and 5.4) indicate the pattern of skeletal distribution of fission products, particularly the high concentrations of radioelements in the epiphyseal region of the long bones. Further, information on these animals (which received a much higher external radiation dose than was received by the native group and over 10 times the internal deposition) should be of considerable prognostic value for the human beings. Nags a * ween eeee . ? eevee ° Autoradiograph of Rongelap Chicken Tibia, 14 x, 21 hr Exposure. Animal Sacrificed Fig. 5.3 45 Days Post-exposure (Argonne National Laboratory Photo). eeoeee b as ‘Wty et Wat The studies on the Rongelap and Uttrik animals included measurement of Internal radio- active contamination and radiochemical analysis of excreta and tissues. The acute hematologt =