This key facts covers Key Facts 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 7 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 12
Practice
13 questions
Recall
11 flashcards
📋 Key Facts
- GM tubes detect radiation by ionisation of gas inside the tube
- Each ionisation event creates a pulse of current that is counted
- GM tubes measure count rate (counts per minute or per second)
- Film badges measure cumulative dose and can identify radiation types using different filter windows
- Cloud chambers make particle tracks visible — alpha leaves thick straight tracks, beta leaves thin wiggly tracks
- Gamma has no charge and leaves no visible track in a cloud chamber
- All detectors work because radiation ionises matter
- Background radiation must be measured and subtracted from all readings
- Workers in radiation environments wear film badges to monitor personal dose
- Count rate is related to activity but is affected by detector efficiency and distance