A radioactive isotope of gold has the symbol 196 86 Au. If this isotope is injected into

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A radioactive isotope of gold has the symbol 19686Au. If this isotope is injected into the bloodstream of a patient, it can be used by doctors as a tracer to monitor the way the patient's heart works. The isotope emits gamma radiation that is detected outside the patient's body.

a. Why would an isotope that emits alpha radiation be unsuitable as a tracer to monitor the working of the heart?

b. Give one non-medical use for a radioactive tracer.

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