Question 5
FA radioactive tracer is injected into a patient. A detector outside the patient's body records the count rate from the tracer.
Figure shows how the count rate changed after the injection.
Figure: The count rate recorded outside a patient's body after a radioactive tracer was injected
a.[2]
Use Figure to determine the half-life of the tracer.
b.[2]
The tracer emits gamma radiation. Explain why a gamma emitter is used rather than an alpha emitter.
c.[1]
Suggest why a tracer with a half-life of 30 seconds would not be used for this investigation.
d.[1]
Suggest why a tracer with a half-life of 30 years would not be used for this investigation.
4.3 Hazards and uses of radioactive emissions and of background radiation Questions
40 exam-style questions on AQA GCSE Physics 4.3 Hazards and uses of radioactive emissions and of background radiation, covering 4.3.1 Background radiation, 4.3.2 Different half-lives of radioactive isotopes, and 4.3.3 Uses of nuclear radiation. Each one has a worked solution and a mark scheme showing where the marks go.