What are radio isotopes? Give one example of a radio isotope. State one use of radio isotopes.

The isotopes of some elements with atomic number (Z) less than 82 are found to be radio active. They are called the radio isotopes. One example of radio isotopes is Cobalt (Z = 27 and A = 60). Radio isotopes are used in the Medical field. Many diseases such as leukemia, cancer, etc. are cured by radio therapy with the help of radio isotopes.