If a radioactive sample contained 1600 billion nuclei and its half life was 57 years, after how many years would there be 400 billion nuclei remaining?
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What is activity measured in?
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What is the best definition of 'count rate'?
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Fill in the blanks.
Select the missing words in the text.
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Which word can be used to describe the process of radioactive decay?
Drag the images into the correct place.
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Look at the slide below to work out the answer.