A worker's skin becomes contaminated with atoms of an alpha-emitting isotope. Why is this contamination hazardous?
The atoms make the worker's skin cells emit alpha particles as well
Alpha particles from outside the body pass through the skin easily
The atoms stay on the skin and keep decaying close to the skin cells
The skin is irradiated once and is then no longer at risk of damage
40 exam-style questions on AQA GCSE Physics 4.2 Atoms and nuclear radiation, covering 4.2.1 Radioactive decay and nuclear radiation, 4.2.2 Nuclear equations, 4.2.3 Half-lives and the random nature of radioactive decay, and 4.2.4 Radioactive contamination. Each one has a worked solution and a mark scheme showing where the marks go.