1.They have been used for teir chemical property radiation. Radionuclides of familiar elements like carbon can be used as the tracers.
2.In nuclear medicine they are used for diagonosis, treatement et cetra. In some forms of tomography like,single-photon emission tomography and positron emission tomogaphy.
3.Used in the treatement hemopoietic which forms tumor.
4.In Genetis and Biochemisty they are used to trace the chemicals like Amino Acid. and help in DNA replication
5.For the food preservation too.
radioactive isotopes can be used to
determine the ages of rocks and fossils
to treat cancer and kill bacteria that causes food to spoil
as "tracers" to follow the movements of substances within organisms