A veterinary clinic uses X-rays to examine a parrot's wing. A detector records the following count rates when X-rays pass through different parts of the wing:
| Part of the wing | Count rate at detector (counts/s) |
|---|---|
| Soft tissue | 820 |
| Bone | 260 |
At the operator's position, the measured dose rates are:
| Arrangement | Dose rate (μSv per hour) |
|---|---|
| No lead screen | 18.0 |
| Lead screen between the X-ray source and the operator | 0.60 |
Explain how the count rates help produce an image that shows the bone.
Calculate how many times greater the dose rate is without the lead screen than with it.
Explain why the lead screen is used to protect the operator.
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.