This exam focus covers Exam Focus — Radiation Detection within Radiation Detection for GCSE Physics. Revise Radiation Detection in Extra Topics for GCSE Physics with 13 exam-style questions and 11 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 10 of 12 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 10 of 12
Practice
13 questions
Recall
11 flashcards
🎯 Exam Focus — Radiation Detection
Most Common Question Types
- Explain how a GM tube detects radiation [3-4 marks] — must mention ionisation of gas, ion movement, and current pulse
- Describe what cloud chamber tracks look like for alpha and beta [3 marks]
- Explain why radiation workers wear film badges [2 marks]
- Calculate corrected count rate from measured count and background [2 marks]
- Compare two detectors for a specific application [3 marks]
What Examiners Want to See
For GM tube questions, the key physics is: radiation ionises the gas (not "detects" — be specific), the ions are accelerated by the electric field, their movement constitutes a current pulse, and each pulse is counted. Many students write "it detects radiation" without explaining the ionisation mechanism — this scores few marks.