* Polonium-210: This isotope of polonium is used as a heat source in radioisotope thermoelectric generators (RTGs). RTGs are used to power spacecraft, satellites, and other remote devices that do not have access to a reliable electrical grid.

* Polonium-209: This isotope of polonium is used as a source of alpha particles for research purposes. Alpha particles are a type of ionizing radiation that can be used to damage DNA and kill cells.

* Polonium-211: This isotope of polonium is used as a radiopharmaceutical for cancer treatment. Polonium-211 can be attached to antibodies or other targeting molecules that specifically bind to cancer cells. When the polonium-211 decays, it emits alpha particles that kill the cancer cells.

* Polonium-212: This isotope of polonium is used as a source of neutrons for research purposes. Neutrons are a type of subatomic particle that can be used to study the structure of atoms and molecules.

* Polonium-214: This isotope of polonium is used as a source of alpha particles for research purposes. Alpha particles are a type of ionizing radiation that can be used to damage DNA and kill cells.