11. Until e-beams became available, radioactive isotopes were used to supply the radiation. 12. This sparked songs about the invisibility of environmental effects like radioactive isotopes . 13. Now they're helping fight disease with radioactive isotopes salvaged from the nuclear waste. 14. Radioactive isotopes can be tested using the autoradiographs of gels in gel electrophoresis.15. Cesium _ 137 is named after a radioactive isotope of caesium. 16. Cobalt-60 is a radioactive isotope often used in cancer treatment and industrial processes. 17. This was first demonstrated by specifically labelling replicating bacterial chromosomes with radioactive isotopes . 18. Bexxar consists of a monoclonal antibody attached to a radioactive isotope . 19. The method uses radiocarbon, abbreviated 14C, a radioactive isotope of carbon. 20. Ukrainian factories and laboratories have seen many thefts of appliances with radioactive isotopes .
