A patient needs an image produced using a radioactive tracer. A more sensitive detector gives a clear image using a smaller amount of the same tracer. Which change makes best use of the new detector?
Use more tracer to obtain the required image with a lower dose.
Use more tracer to decrease the half-life and improve the image.
Use less tracer to increase the half-life and improve the image.
Use less tracer to obtain the required image with a lower dose.
97 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.