A blockage in a patient's kidney can be found either by using a radioactive tracer or by carrying out exploratory surgery. Which is the best evaluation of using the tracer?
The tracer is better, because it carries no risk of harm to the patient at all
Surgery is better, because it avoids exposing the patient to any radiation
The tracer is worse, because the radiation dose it gives is always very large
The tracer is better, because it avoids surgery, although it gives a small dose
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.