placenta , umbilical cord with membranes , amniotic fluid , foetal blood ( from the umbilical vein ) , maternal urine and breast milk were examined for the non-natural radioisotopes 131iodine , 103ruthenium , 134caesium , 137caesium originating mainly from the nuclear power plant accident in chernobyl compared with 40potassium existent in the natural environment .
C0041633
umbilical cord
C0041637
umbilical vein