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Background Radiation (GCSE Physics)

The following is a GCSE Physics test covering 'Background Radiation' from the broader topic Atomic Structure. The test is geared towards the AQA exam board style syllabus.
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Why is reducing exposure time a recommended radiation safety precaution?
Which of the following best describes contamination (in radiation safety)?
A radioactive source emits ionising particles without any external energy input. Which process describes this emission?
Radon is a naturally occurring source of background radiation. Where does it mainly come from?
Which device is commonly used in school labs to detect and count ionising particles?
What does the half-life of a radioactive isotope describe?
Which answer correctly lists two natural sources of background radiation?
In radioactive decay, an unstable nucleus emits a beta particle. Which change occurs in the nucleus?
Which of the following is a type of background radiation that comes from outer space?
Why is background radiation always measured before an experiment with a radioactive source?
Which practice reduces contamination risk when working with radioactive materials?