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Radioactive Contamination (GCSE Physics)

The following is a GCSE Physics test covering 'Radioactive Contamination' from the broader topic Atomic Structure. The test is geared towards the AQA exam board style syllabus.
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Why are short half-life radioactive isotopes sometimes preferred for medical imaging?
Which property is true for background radiation?
A sample has activity 800 Bq. After one half-life the activity will be:
Which statement about contamination control is correct?
Which statement about alpha particles is correct?
What is the correct unit for measuring the activity (decay rate) of a radioactive source?
Which of these reduces contamination spread when handling unsealed radioactive liquids?
Why is keeping a record (dosimeter readings) for workers important in a facility handling radioactive materials?
Which is the best shielding material to reduce exposure from gamma radiation in a laboratory?
Which route of internal contamination is most likely if someone inhales radioactive dust?
If a contaminated area is cleaned by removing loose material and washing, which decontamination method is being used?