CAIE A-Level Physics A2 24.3.1 A Tracer Is a Substance Containing Radioactive Nuclei That Can Be Introduced Questions

Practise defining a medical tracer as a substance introduced into the body and absorbed by the tissue studied, then judging whether its half-life is suitable.

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define a tracer as a substance introduced into the body and absorbed by the tissue being studied

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Fluorine-18 $\left({ }_{9}^{18} \mathrm{~F}\right)$ is a radioactive nuclide that is used as a tracer in positron emission tomography (PET scanning). Fluorine-18 decays to a nuclide of oxygen ( O ) according to

{ }_{9}^{18} \mathrm{~F} \longrightarrow{ }_{P}^{Q} \mathrm{X}+{ }_{8}^{R} \mathrm{O} \text {. }

State what is meant by a tracer.

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CAIE A-Level Physics A2 24.3.1 A Tracer Is a Substance Containing Radioactive Nuclei That Can Be Introduced Questions question 1