A museum laboratory uses X-rays to produce images of ancient animal bones before the bones are removed from hardened soil. It compares two complete imaging plans. Both plans produce images with enough detail for the museum's study.
Measurements give the X-ray dose reaching the technician during one exposure. The technician's total dose is the combined dose from every exposure in the plan.
| Plan | Number of exposures | Dose reaching technician in one exposure / µSv |
|---|---|---|
| M | 8 | 0.30 |
| N | 5 | 0.42 |
Calculate the total X-ray dose reaching the technician for each plan. State which plan gives the lower total dose.
Explain why using this plan reduces the risk from X-rays to the technician.
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.