CAIE A-Level Physics A2 24.3.2 That a Tracer That Decays By Decay Is Used in Positron Emission Questions

Practise identifying β⁺ decay as the source of positrons in PET, and explaining how a radioactive tracer produces the medical scan.

Exam points

explain how a β⁺-emitting tracer introduces positrons during PET scanning
identify PET scanning as the medical application of β⁺ tracer decay

[Maximum number: 2]

Positron emission tomography (PET scanning) involves the detection of gamma-radiation in order to identify the position of origin of positrons in the body.

Positrons are not naturally present in the body.

Explain how positrons come to be present in the body during PET scanning.

introduction of tracer (into the body)
containing a $\beta^{+}$ emitter

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CAIE A-Level Physics A2 24.3.2 That a Tracer That Decays By Decay Is Used in Positron Emission Questions question 1