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Which of the following statements about tracers is UNTRUE?
Radiotracers are used to trace the path of atoms of an element in a chemical or biological process.
Tracers are substituted in chemical reactions and are chemically distinguishable with other isotopes of the same element.
Tracers help in studying mechanics and kinetics of chemical reactions.
Tracers are obtained by irradiation of stable elements with high-speed projectiles from a cyclotron.