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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 must radioactive sources be stored in labelled, secure containers?
Which answer correctly lists two natural sources of background radiation?
Which instrument would a radiation worker wear to monitor their personal exposure?
Which property distinguishes ionising radiation from non-ionising radiation?
Which particle is least penetrating and can be stopped by a sheet of paper?
Which of the following best describes irradiation (in radiation safety)?
Which device is commonly used in school labs to detect and count ionising particles?
If distance from a small radioactive point source is doubled, how does the intensity (count rate) change (ignoring absorption)?
What does the half-life of a radioactive isotope describe?
A radioactive source emits ionising particles without any external energy input. Which process describes this emission?
Which practice reduces contamination risk when working with radioactive materials?