Matching radiation to use: Think about what properties each use needs:
- Smoke detectors — need to stay INSIDE the detector → short-range → Alpha
- Paper thickness — need to partially go through paper → Medium penetration → Beta
- Checking welds — need to go through thick metal → Maximum penetration → Gamma
- Medical tracers — need to escape the body to be detected → Gamma
Safety 3Ds: Distance, Duration (minimise time), Dense shielding (lead). Always apply the 3Ds when working with radiation.
Irradiation vs Contamination: "Irradiation = Illuminated from outside (like a lamp). Contamination = Contaminated from inside (like a dye in water)."
This memory aid covers Memory Aids within Uses & Hazards of Radiation for GCSE Physics. Revise Uses & Hazards of Radiation in Atomic Structure for GCSE Physics with 18 exam-style questions and 5 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 13 of 17 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Practice questions for Uses & Hazards of Radiation
Which type of radiation is used in smoke detectors?
Explain how a smoke detector uses an alpha source to detect smoke.