Write five applications of isotopes in various fields.

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(N/A) Some applications of isotopes are:
$(i)$ An isotope of uranium $(U-235)$ is used as a fuel in nuclear reactors.
$(ii)$ An isotope of cobalt $(Co-60)$ is used in the treatment of cancer.
$(iii)$ An isotope of iodine $(I-131)$ is used in the treatment of goitre.
$(iv)$ An isotope of sodium $(Na-24)$ is used to detect constrictions in the circulatory system and to detect blood clots.
$(v)$ An isotope of chromium $(Cr-51)$ is used to study blood diseases.
$(vi)$ The uptake of phosphorus by plants is studied using an isotope of phosphorus $(P-32)$.

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