00253nam a2200109Ia 4500008004100000082002200041245003200063260001500095300000900110600001100119650001300130140117s9999    xx            000 0 und d  a621.039.85.004 L7  aIsotopes in day today life.  bIAEAc1977  a64p.  aVienna  aIsotopes