Which of the following statements about the applications of radioactive emissions is not correct?
γ\gammaγ-radiation is used to sterilize medical equipment because it kills bacteria and can penetrate packaging.
α\alphaα-particles are used as radioactive tracers in the human body because they can be easily detected from outside the body.
β\betaβ-particles are used to monitor and control the thickness of plastic or paper sheets in industries.
Smoke detectors use an α\alphaα-source to ionize the air between two electrodes.
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.