Four applications of isotopes :
(A) isotope of uranium is used as nuclear fuels in nuclear reactors in power plants.
(B) isotope of cobalt is used to remove brain tumor and in its treatment.
(C) isotope of sodium is used to diagnose the circulation of blood.
(D) isotope of carbon is used in fossil dating.

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Four applications of isotope :
Cobalt c-60 and fullerene c-60 is used in the treatment of cancer
=>Sodium-24 is used to locate leaks in pipelines
=>Californium-252 is used in to determine the moisture content of the soil.
=>Thallium-201 is used to detect heart failures and tumors.