When working with radioactive sources in a laboratory, safety measures must be followed to reduce the received dose of radiation. Which of the following is not a safe procedure?
Handling the radioactive sources directly with bare hands to ensure a secure grip.
Keeping radioactive sources shielded with appropriate materials such as lead.
Maximizing the distance between yourself and the radioactive source.
Minimizing the total time spent in close proximity to the radioactive source.
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.