Uses of some Radioactive elements

We some times think that Radioactive materials are harmful.But often threy are useful to us .Some of the uses of  Radioactive materials are her under
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The ages of most ancient formations are estimated by carbon dating.The substance used is Radioactive Carbon .

Radio isotope used in agriculture is Radio Phosphorus.

The isotope used in treatment of cancer is Radio Cobalt.

The Radio Isotope used to cure Luekemia(Blood cancer) is Radio Phosphorus.

The radio isotope used to find wer and tear in machines is Radio Iron.
The element used to treat hypothyroidism is Radio Iodine