CAIE IGCSE Physics 5.2.5.3 Safety Precautions for All Ionising Questions
Learn how limiting time, increasing distance and adding shielding protect people near radioactive sources.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- reduce exposure time because absorbed dose increases with time near a source
- increase distance with tongs or remote handling so less radiation reaches tissue
- use lead, thick concrete or another suitable absorber as shielding
CAIE IGCSE Physics 5.2.5.3 Safety Precautions for All Ionising Questions question 1
[Maximum number: 2]
Radioactive isotopes that emit ionising radiation are used in hospitals.
State and explain two safety precautions necessary for the use of these isotopes in medical procedures.
safety procedure 1
explanation
safety procedure 2
explanation
any two from:
- reduce exposure time AND low(er) amount of radiation absorbed
- increase distance between source and hospital staff AND lower amount of radiation reaches staff
- use of shielding (e.g. walls, lead etc.) AND radiation absorbed by shielding / cannot penetrate through shielding
- use isotopes with short half-life AND lower amount of radiation emitted from patient / radiation (above background) emitted for a shorter period of time
- use of film badge / dosimeter AND manage individuals exposure owtte
- restrict pregnant staff / patient in hospital AND radiation may harm foetus owtte
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