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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?
A radioactive source emits ionising particles without any external energy input. Which process describes this emission?
Which particle is least penetrating and can be stopped by a sheet of paper?
What does the half-life of a radioactive isotope describe?
Which property distinguishes ionising radiation from non-ionising radiation?
A sample has an activity of 3000 Bq. Which statement is correct?
Which factor does NOT affect background radiation levels in a location?
Why must radioactive sources be stored in labelled, secure containers?
If distance from a small radioactive point source is doubled, how does the intensity (count rate) change (ignoring absorption)?
In radioactive decay, an unstable nucleus emits a beta particle. Which change occurs in the nucleus?
Which device is commonly used in school labs to detect and count ionising particles?