A Geiger-Müller tube and counter are used to measure the radiation level in a laboratory. Even when no radioactive source is placed near the detector, a low count rate is still recorded. This is due to background radiation.
Which of the following does not contribute to this background radiation?
cosmic rays from space
radioactive radon gas from the ground
Wi-Fi and mobile phone signals
medical procedures such as X-rays
484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.