A scan gives a patient a dose of 10 mSv. This raises the patient's lifetime risk of developing cancer from 50.00% to 50.05%. The scan will show whether the patient has a serious illness. Which is the best evaluation?
The scan should not be used, because any increase in the risk of cancer is unacceptable
The scan should not be used, because the dose is larger than the yearly background dose
The scan is worth using, because the benefit is large and the extra risk is very small
The scan is worth using, because the radiation destroys any cancer cells already present
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.