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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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Which of the following is a type of background radiation that comes from outer space?
A sample has an activity of 3000 Bq. Which statement is correct?
Which answer correctly lists two natural sources of background radiation?
What is a common use of radioactive isotopes in medicine?
A source’s count rate measured on a detector is reduced to one quarter. How many half-lives have passed?
Which type of radiation is electromagnetic and highly penetrating, requiring dense material (like lead) for shielding?
Which method reduces long-term hazard from radioactive waste?
Which practice helps reduce exposure when working with open sources in a lab?
Which of the following best describes contamination (in radiation safety)?
Which device is commonly used in school labs to detect and count ionising particles?
Which of the following best describes irradiation (in radiation safety)?