... 放射性同位素年代学 radioactive isotope chronology 放射性铅定年，放射性铅测年 radioactive lead dating 放射性测录 radioactive log ...
双语例句
1
Most famously, uranium-238 decays into lead-206 with a half life of 4.5 billion years, though radioactive rubidium and samarium are also useful for dating things billions of years old.