An engineer introduces a radioactive isotope into an underground water supply system to locate a suspected leak.
Suggest, with a scientific reason, one physical property the radioactive isotope must have to be suitable for this specific use.
90 exam-style questions on Edexcel GCSE Physics 6.3 Nuclear equations and decay, covering 6.3.1 Beta-minus and beta-plus decay, 6.3.2 Effects of decay on the nucleus, and 6.3.3 Balancing nuclear equations. Each one has a worked solution and a mark scheme showing where the marks go.