Which list only includes man-made (artificial) sources of background radiation?
medical X-rays, radon gas, cosmic rays
medical X-rays, nuclear fallout, nuclear power stations
cosmic rays, food and drink, rocks and soil
nuclear power stations, rocks and soil, medical X-rays
44 exam-style questions on CIE IGCSE Physics 5.2.1 Background radiation and measuring count rate. Each one has a worked solution and a mark scheme showing where the marks go.