A manufacturer needs to sterilise sealed packs of syringes. The packs must remain sealed, and the treatment must kill at least 99.9% of the microorganisms inside each pack.
| Treatment | Radiation | Radiation transmitted through a complete pack | Microorganisms inside the pack killed |
|---|---|---|---|
| A | ultraviolet | 0.2% | 36.0% |
| B | gamma | 94% | 99.80% |
| C | gamma | 94% | 99.97% |
Explain which treatment should be used. Include why protection is needed and one way workers should be protected from the radiation.
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.